Matlab cellfun contains Now we can create a handle on a function that we don't name (anonymous). Thread-Based Environment Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ Anyway, when you write the function that cellfun() must use, it's often the same algorithm --it's just that with a for loop you need to enclose that code in a for loop instead of passing it to the cellfun() function. The wildcards in your pattern statement are likely the cause of the problem; contains doesn't need them. Syntax. 30. When you're comparing individual strings with each others, strcmp returns a scalar, so you don't need to have 'UniformOutput', false in your cellfun call. So, we need to switch to plain, old (single-quoted) char arrays. We want to calculate the mean of each matrix. In the see also section, we get a link to strfind. 0 Comments. They are processed in the mex level and faster. When comparing the median speeds, the loop method was ~22 times faster than the cellfun method (I repeated that process twice and got nearly the same results). I have a cell array of strings, I want to detect the num of times the string changes and get the indxs for the changes. for ii = 1 : numel(D) D{ii}(isnan(D{ii})) = 0; end cellfun is essentially a for loop under the hood. Alternative Approach. Learn more about cell array, function, live script Hi, I would like to run the following line of code lhs=(cellfun(@eval,script)); script is a cell array and the content Each of this string is the name of a test (20-MAG-C-Z1-S0A) and they have an indicator inside de name (S0A,S0B,S0C). I am trying to implement a cellfun call that takes structfun as its function that, at the end of the day, will resize all of the vectors in Your cellfun code simply says: negate the content of each cell in the outer cell array. Pseudocode DD = {[9 1 5 6 6 6 5 1 1 0 7 7 7 7 7 8], . Consider I want to apply a function to each element of a cell array -- so I have cellfun for that. I have a cell array that contains a number of double matrices. Would some form of cellfun do the trick? matlab; compare; cell; Share. I appreciate you time, feedback, and comments. Modified 9 years, 8 months ago. ('elem3')}. I want to create an array from all the numbers of this field from all the structs in the cell array. If the cell contains e. 0. For each of them, I want to extrat the position of the Learn more about timetable, data import, array2timetable, multiple time columns MATLAB. 2. You simply specify which dimension you're measuring the size of and it'll return an array of elements that denote the size of each cell in a particular dimension. I tried following but it does not seems to work. E. I know I can use "contains" to look for individual substrings, but I want to know if ALL substrings are in a string. In one of my functions I use contains() which was only introduced in 2016b and is thus not backward compatible. You're basically using a loop (cellfun) to compare each individual string with 'A3'. Hey guys, I'm trying to use the function datestr on a cellmatrix using the option 'local'. . cellstr( ["abc", "def"] ) => {'abc','def'} Then you don't have to care about variable types, and can just do an ismember check on every The string functions aren't as flexible as could be when all the cell array content is character; you have to use some roundabout ways to do the search with vectorized Matlab functions-- >> c={[] [] [] 'Del Col_2010' }; % a short example of case for demonstration And as usual I mention that "cellfun('isempty', x)" is faster. The following code works just fine. Hello everybody, I have some problems to get the indices of a certain value, in this case -1, within a cell array. Here is all the code. The output array D is the same size as the cell array C. Are arrayfun and cellfun always faster than functionally equivalent for loops? If so, why? (E. D = cellfun Each element of D contains the value returned by fname for the corresponding Learn more about matlab, isa(), numeric type I need to check that all columns of a data table I receive from an user's Excel file contain only numeric values and no text before I Hey guys! I am having trouble modifying these cell arrays to remove any NaN, string, or complex variables. For example, to return output values in a cell array, specify how to find out the index of a cell array that Learn more about cellfun, cell array, contains, substring MATLAB I wish to test if a multi-element cell array of strings contains a substring anywhere within the cell array's text, returning a logical true or false answer. val2, and call cellfun() with @add_val2 instead of @plus. Show -2 older comments Hide -2 older comments. The only way around this is when setting properties of handle objects when you can use the set command instead of an = statement, however that doesn't apply for matrixes like And as usual I mention that "cellfun('isempty', x)" is faster. Say my cell array is 'C:\svnTrunk\RadarLib\radarlb\utilities\scatteredInterpolant. Here's my toy example. *' Sum of elements in cell array. Taking the object array route, I can use frompyfunc to apply this function to elements of a list I know of the way to first replace all of empty cells with 0 and they use the find and cellfun function. A = cellfun(func,C) applies the function func to the contents of each cell of cell array C, one cell at a time. Follow edited Jan 25, 2017 at 1:09. Cellfun versus Simple Matlab Loop performance. I guess in Octave it is not A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. (IsNum) = cellfun(@size, C(IsNum), 'un', 0); 1 Comment. Although small objects contain char elements, they are concatenated into cell arrays. This type of logical indexing can be used to make many workflows more efficient. However, that content is itself a cell array and matlab doesn't know how to negate a cell Learn more about cell, cellfun Hi all, I have a cell like this K>> respCol respCol = 1×24 cell array Columns 1 through 5 {3×1 cell} {3×1 cell} {3×1 cell} {3×1 cell} {3×1 cell} Columns cellfun. D = cellfun Each element of D contains the value returned by fname for the corresponding element in C. m' 'C:\svnTrunk\RadarLib\radarlb\ Don't use cellfun then. simple for-loop. As I want to include this in find the cell array contains a specific string. I want to use cellfun to call a custom function that will take a parameter like 'ABC' then for it to return a vector where ABC is present so the answer should look like below, [1 9 10 11] How do you go about creating a custom function for cellfun? I would urge you to take a look at cellfun. I would urge you to take a look at cellfun. In that case, in order to put all these objects in an array, you will have to derive each class from Learn more about timetable, data import, array2timetable, multiple time columns MATLAB. If pat is an array containing multiple patterns, then contains returns 1 if it finds any But the more important question is why you want to use cellfun for a more complex situation. MATLAB cells were it's attempt to handle general lists like a real language. By giving a keyword that is part of the element in the header cell array, I should find out the column and take the data from that column. But in general, in Python uses lists where MATLAB uses cells. C = {[10x2], [10x2],[10x2]} However, I want a new cell that Skip to main content strfind returns a scalar cell that contains a numeric array, which contains indices of occurrences of the substring ain in str. When calling cellfun, I was hoping I could get some help using the cellfun function in MATLAB. Each cell in A contains a 3x1 cell. And to me, having understandable, maintainable code (that others have written and I've inherited) is much more inportant than compactness. D = cellfun('fname',C) D = cellfun('size',C,k) D = cellfun('isclass',C,classname) Description. A(all(cell2mat(cellfun(@(b) cellfun(@isempty, strfind(A(:,end),b)). Thumree Sarkar on 29 Mar 2017 To remove rows of A which contain at least one of the strings in B. Learn more about speed, arrayfun, cellfun, for loop, optimization MATLAB. [Lia,Locb] = ismember(___) also To convert a cell array of character vectors to numbers, you can use the |str2double| function. But the function requires two inputs, one would be the cell array,A, and the other is B, a Text files are stored as streams of bytes, with operating-system-specific bytes indicating end-of-line. This section describes a few common scenarios. Learn more about cell array, function, live script Hi, I would like to run the following line of code lhs=(cellfun(@eval,script)); script is a cell array and the content of each I want to apply a function to every cell within a cell array, so using cellfun seems the logical way to go. My code without the 'local' option looks something like this: C = cellfun(@datestr, C, 'UniformO Skip to content. I would like to multiply the second column of every cell For any input cell whose text does not contain 'bla', “strfind” returns an empty cell. Afterwards I wanted to give the dates which contain measurements the corresponding values. Apply function to each element in cell array. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Most of the data processing functions in MATLAB® operate on a rectangular array with a uniform data type. Your cellfun code simply says: negate the content of each cell in the outer cell array. My original solution has You cannot use those kinds of conditionals in cellfun, at least not without the use of an auxillary true function that does the equivalent of the C/C++ question-colon operator. The outer cellfun identifies all cells for which the inner cellfun found a match, and the prefix tilde turns that into all cells for which there was NO Really? I just timed the loop method from your question and the cellfun() method from my answer. Matlab: arrayfun, cellfun, spfun and structfun vs. Let's stick to the example from the documentation on contains: In Octave, there are no (double-quoted) strings as introduced in MATLAB R2017a. For the second cell, the column contains data and array, therefore 0 and 0 are returned. Because I think there is a more Most of the data processing functions in MATLAB® operate on a rectangular array with a uniform data type. what's the correct way of passing the cellArray into cellfun (2nd input argument))?. My solution below would work really well, were it not for the 'UniformOutput', false-part. However, that content is itself a cell array and matlab doesn't know how to negate a cell I want to apply a function to every cell within a cell array, so using cellfun seems the logical way to go. For example A{1,1} have three 119x755 matrix in each cell. Suppose a certain field contain numbers. This makes it convenient to use cellfun on them. First, create the function add_val2. 683212 seconds. in MATLAB. The "rows" option does not support cell arrays, unless one of the inputs is either a categorical array or a datetime array. If pat is an array containing multiple patterns, then contains returns 1 if it finds any For me the content of the cellfun() and its function is clear, exept of the expression @(data). Ive tried a few different versions of removing NaN, but it doesnt work on the cell array X, and then for the array Y it wont remove the final string. And in a third step I wanted to replace the dates that contain a value of -1 also with a I have a nested cell array named 'events'. I have a folder with a bunch of A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. How I would determine if a string contains Learn more about strings MATLAB, Text Analytics Toolbox. colorList = { 'Red' , 'Green' , 'Blue' , 'Purple' }; % List of values to match with stringToCheck = Hi, I am working with a pair of cell arrays, containing strings. The Matlab verison I am using is Matlab R2021b. cellstr( 'abc' ) => {'abc'} cells of chars e. I found a function here but it does not work for my problem. Each cell contains either 1 or more than 1 cells which in turn contains time series. Consider this 2-by Learn more about string, cell array, find, contains, cellfun MATLAB I am trying to efficiently find which strings (character vectors) match between two cell arrays. I am creating the if statement to tell matlab how to break up either a 20 character message or 28 character Each of this string is the name of a test (20-MAG-C-Z1-S0A) and they have an indicator inside de name (S0A,S0B,S0C). Because cell arrays can contain a mix of types and sizes, you sometimes must In general, removing elements is the easy part. cellfun doesn't magically vectorize your code; it only hides the loop. 9. chappjc. The string functions aren't as flexible as could be when all the cell array content is character; you have to use some roundabout ways to do the search with vectorized Matlab functions-- >> c={[] [] [] 'Del Col_2010' }; % a short example of case for demonstration You can do this in a pretty one-liner: m(any(cellfun(@(x)x(1)==0, m),2), :) = [] Alternatively: m(any(~cellfun(@ischar, m),2), :) = [] which is a tad faster. But the function requires two inputs, one would be the cell array,A, and the cellfun for objects. % cellfun + isequal; Elapsed time is 1. Consider I want to use cellfun function on strfind function to find the index of each string in a cell array of string in another cell array of strings to exclude them from it. Learn more about find array cellfun for objects. In each cells, I have mesh data for a surface. My question is, if there is a better way to do this. round changes the value of the string therfore I can't use formulas like cellfun( Your cellfun code simply says: negate the content of each cell in the outer cell array. ~true==false. This works, but may contain more code than you hoped for. This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. strings = {'aaa','bbb','ccc' A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. However, the function takes two extra arguments (a string and a vector), which I want to keep constant for You cannot use those kinds of conditionals in cellfun, at least not without the use of an auxillary true function that does the equivalent of the C/C++ question-colon operator. Checking if a cell contains a specific value MATLAB. Each member is a 3 x 2 matrix which include 3 cell member at its first column and 3 array matrix at the second column. e. My code is designed to read data from an excel spreadsheet, including text. Learn more about cell arrays, cell array, sum, for loop, matrix array MATLAB MATLAB Function Reference : cellfun. Elsewhere, the array contains logical 0 (false). However, the function takes two extra arguments (a string and a vector), which I want to keep constant for all the elements of the cell array; i. Learn more about cell array, ismember You need to use cellfun to group corresponding entries in each of the elements in varargin. If you don't have a MATLAB version with contains you can substitute a regex: test(ii) = ~isempty(regexp(mixedCellArray{ii}, querystr, 'once')); Share. Functions handles are better, but the built-in string functions are really fast: All above mentioned answers are incorrect, because in my case when i used them, they removed empty cells and then all elements of my cell array situated in a row manner is not valid Matlab syntax, because the surrounding braces are essential. D = cellfun('fname', C) D = cellfun('size', C, k) D = cellfun('isclass', C, classname) Description. strings, the 'size' command (as char vector) will fail. orig_reg' where the corresponding strings I am trying to find is 'a_13'. You can use Name,Value pair arguments with the input arguments A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. To access the numeric array within the cell, use curly braces. 6k 6 6 gold badges 77 77 silver badges 135 135 bronze badges. % loopint + isequal; It even l = cellfun(@(c)strcmp(c,Event),Check, 'UniformOutput',false); This produces a cell array the size of Check with logical arrays the size of Event. For example, given the cell TF = contains(str,pat) returns 1 (true) if str contains the specified pattern, and returns 0 (false) otherwise. While I expect my code to work with D fluently, when you search for the character '5' instead of the Your cellfun code simply says: negate the content of each cell in the outer cell array. However, this new changes Learn more about strfind, string, find, cell array MATLAB Hiyah I'm searching a cell array for an exact string, e. So you need another cellfun to go into these inner cell array: Ask questions, find answers and collaborate at work with Stack Overflow for Teams. Ask Question Asked 13 years, 1 month ago. This approach eliminates the need for explicit loops, enhancing code However, in your case it appears that you're using two different classes. The content of the cell is a character string referenced by "the curlies" where as the cell or a set of cells are addressed with regular parens. Equation,x),OutputData. g the data I am searching contains both 'Las Vegas, NV' and 'North Las Vegas, NV' and I want specifically the coordinats of 'Las Vegas, N MATLAB Function Reference : cellfun. For each of them, I want to extrat the position of the string that contain the mentionen indicator, but without a loop, since in same cases i could have more than 100000 tests. However, that content is itself a cell array and matlab doesn't know how to negate a cell TF = contains(str,pat) returns 1 (true) if str contains the specified pattern, and returns 0 (false) otherwise. The Learn more about strfind, string, find, cell array MATLAB Hiyah I'm searching a cell array for an exact string, e. I am trying to determine if the data is numeric and the dimensions of Skip to content. If C is your array, removing cells specified by the indices in vector idx can be done by:. This works only when the cell content is scalar! dataC(cellfun(@isinf, dataC)) = {NaN}; Edit: Thanks @Luis Mendo for mentioning, that the use of find is not needed here. And then use this to perform your cellfun operation on the subset of the cell array that contains numeric I want to apply a function to each element of a cell array -- so I have cellfun for that. Although the documentation claims, that this style is kept for backward compatibility only, the string commands are built into the Mex, while the function handle commands require a return to the Matlab interpreter for each cell element. will give you the indices into your string to the start of any matching elements. An exception are the commands provided as char vectors to cellfun(): 'isempty', 'islogical', 'isreal', 'length', 'ndims', 'prodofsize', 'size', 'isclass'. You can use Name,Value pair arguments with the input arguments I am having some trouble with Matlab right now. Both regexp and contains will work on a vector with a scalar, removing one of the loops. Hot Network Questions Why does the special character `?` need to be A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. % contains; Elapsed time is 50. As a result, your Match would be a matrix and you wouldn't need the subsequent Each cell contains 2 cells, which contains a matrix of X datapoints. But usually The string functions aren't as flexible as could be when all the cell array content is character; you have to use some roundabout ways to do the search with vectorized Matlab functions-- >> c={[] [] [] 'Del Col_2010' }; % a short example of case for demonstration Most of the data processing functions in MATLAB® operate on a rectangular array with a uniform data type. It gives a logical index with true for cells that contain {[]} and false for other cells. confusion in the output of cellfun function. If you wish to find the indexes from the logical array, you can use the find function with outputs [row,col]. You are correct that you can't use = within anonymous functions. Viewed 7k times 14 Is there You can write a custom function add_val2(x, y), which adds y to the field x. Using cellfun for mean of cell. So I got a a=1x130 cell and a{1}='1-v1'; a{2}='. How would I go about making a function that determines if a cell contains numeric data? It is a single cell, not a cell array. *' a{3}='3+v2' a{4}=1x3 cell Learn more about cell arrays, matlab MATLAB Hello everyone, I am trying to round figures in a cell array however in that same array I also have string types. Honglei Chen on 28 Jun 2012. That extra layer hiding the loop add overhead, resulting in code that is slower than a loop. You can index like this: My data are in the form of a cell array of structs. Thumree Sarkar on 29 Mar 2017 TF = contains(str,pat) returns 1 (true) if str contains the specified pattern, and returns 0 (false) otherwise. Improve this question. it would be better if you wrote it out in Matlab code for potential answerers to just copy and paste for testing. : A = {'ABC' '123'; 'A' cellfun. 144104 seconds. I am familiar with cellfun, however, I am simply struggling with the correct syntax for identifying the specific columns (i. result = cellfun(@(x)isequal(x,{[]}), Cell_Array); I want to apply a function to every cell within a cell array, so using cellfun seems the logical way to go. You can use Name,Value pair arguments with the input arguments I have the following problem: I have a cell array which contains in each cell a certain struct (structs have the same fields but different information). Isn't this problematic if the order of the cells in the cell arrays is actually meaningful? matlab I want to apply a function to every cell within a cell array, so using cellfun seems the logical way to go. This function is the simplest method. 000000'}; M = str2double(C) The |cell2mat| function converts a cell array of character vectors to a character array, and only if all the character vectors have the same length. Use an actual for loop:. For example, to return output values in a cell array, specify 'UniformOutput',false. the only issue that i need to substract from the result 330 (which i don't konw why: maybe because i have two colonne before the colonne which contain the path) Can any one help me to find a solution instead of substracting 330 If so then cellfun() and strfind() and isempty() The matching process on a cellstr can also be done by regexp(); you might need to cellfun() isempty() to determine the logical result for each entry. When calling cellfun, I try to find arrays in my cell which have to part 'HA' in their names. g. You can use Name,Value pair arguments with the input arguments MATLAB Function Reference : cellfun. MATLAB: How to use cellfun with a struct? Hot Network Questions A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. One cell array contains ~1000 equations written as strings that I'm trying to parse by matching to A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. IndexC = C1 has two cells and each cell contains a vector of three elements: C1 = 1×2 cell array [1×3 double] [1×3 double] If I want to add 1 to the contents in every cell, I can define the function This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. C = {'0. But the Learn more about cellfun, varfun, str2num, str2double, type conversion . However is it possible to apply cellfun only to one column in a cell array and not have it affect the other columns? I was hoping I could get some help using the cellfun function in MATLAB. I want to write a code where, if the cell contains more than 1 cell arrays of time series, I want to find the standard deviation of each of those time series and retain only the time series with the highest standard deviation. %% T = table({'147956, Find the treasures in Learn more about cell, character, ischar MATLAB Hey, I need to check if my cell contains another cell or if the contant is a character vector. Tags cellfun; varfun; str2num; str2double; type MATLAB Function Reference : cellfun. Find more on Data Type Conversion in Help Center and File Exchange. The required function is defined by c{1}*2^(7-n) , and it is preformed only on the contents of the first two cells of each of the sub-cellarray due to the indexing C(1:2),1:2 . My cell looks like this: 'HA1' 'HA1' 'HA1' 'HA1' 'HA1' I can't work out the notation to reference them all in one go, like this: MyArrayOfSubStrings = CellArrayOfStrings{:}(3:4); % Incorrect notation! This is because curly braces ({}) return a comma-separated list, which is equivalent to writing the contents of these cells in the following way:c{1}, c{2}, and so on. I'd like to do something like: cellfun(@myfun, cellarray, const1, const2) meaning: Here is the solution for summing row of each matrix with a cell , if you read the documentation of cellfun carefully, I think you should be able to get it. Hi all, I have a cell like this K>> respCol respCol = 1×24 cell array Columns 1 through 5 {3×1 cell} {3×1 cell} {3×1 cell} {3×1 cell} {3×1 cell} Columns Skip to content Get MATLAB MATLAB; Sign In to Your MathWorks Account; My Account; My Community Profile; Link License; Sign Out; MATLAB I am trying to apply a function to specific columns of every cell in a cell array. As I want to include this in For any input cell whose text does not contain 'bla', “strfind” returns an empty cell. 000000'; '10. I want to see if for every word in the cell array contains the letter 'o', how to use cellfun() to achieve the following in a compact expression? b = [ contains(a(1),'o') I would like to find the elements of a cell array that contain part of a specified string. C = {[10x2], [10x2],[10x2]} However, I want a new cell that Skip to main content To add to CST-Link's answer, cellfun has a special flag where if you specify 'size', you can determine the size of of elements inside each cell in a cell array. To use the approach you proposed in the question, remove the UniformOutput-property, this way a logical index is returned and the elements can be addressed directly. To process individual cells, you can use the cellfun function. Example. However, that content is itself a cell array and matlab doesn't know how to negate a cell array. 7. (MS Windows historically required both Carriage Return and Line Feed Which one is better, using all the *fun functions (arrayfun, cellfun, structfun and spfun) or simply using for loop? What method gives better performance and which methods I have a 5x9 cell array A. In addition, the 'uniformoutput',false notation determines if the output is written to a regular arral or a cell cellfun('isempty') is much faster than cellfun(@isempty). By default the result would be a cell array of length equal to the length of your elements cell array and in each cell of the result will be an array of indices to the start of any matches of that element. I read a text file, out of which I create different objects, with one of the objects having the others as attributes. Each sensor has it's own I have a 5x9 cell array A. You can adopt a new approach that translates the input of cell array of cell arrays of strings to cell array of strings, thus reducing one level "cell hierarchy". numpy arrays with dtype=object behave similarly, adding multidimensions. The cell arrays are of the same size, and they contain the same rows, but in different order. cellstr( "abc" ) => {'abc'} string arrays e. For any input cell whose text does not contain 'bla', “strfind” returns an empty cell. When the subscript index refers to only one It's a cellstr array, and yes, it can be confusing how to address them. But the function requires two inputs, one would be the cell array,A, and the other is B, a 41x1 matrix. However I prefer not to do this. mixin. We could call a double cellfun as the one before, or my function: This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. m:. Improve this answer. Consider I know cellfun can be applied to an entire cell array and understand its syntax. Sign in to answer this question. The only thing that is stored on disk is the original text file. The first version checks the number of elements directly in the Mex function, the later calls Matlab by mexCallMATLAB for each element. If it's beyond your current level, then stay with a matches=cellfun(@(x) contains(Equations(ii). The workaround is mask = cellfun(@(y) y>2, Y); Matlab cellfun on function strfind. We'll use this function, which is also implemented in Octave to create an anonymous function mimicking the In MATLAB, cellfun is implemented as an M-file (or rather, it was the last time I checked, but it's quite some years ago), so cellfun always adds the overhead of a function call (with all the parameter checking), and the overhead of repeatedly calling a function through a handle, and so it just cannot be faster than spelling out the loop. Taking the object array route, I can use frompyfunc to apply this function to elements of a list So the difference is that cellfun takes care of the dereference operation which is required to do detailed operations on individual elements of a cell when looping (that is, the {}), whereas arrayfun just performs the standard indexing (that is, the ()). Here is a matrix on the left which contains with 2 cell members. Show -1 older comments Hide -1 older Learn more about strfind, isempty, cellfun I am trying to find the indexes in a struct 'data. But is there a simpler way? Lets say A={2 5 0 10 0 [] 22 0 13} index=find(~cellfun(@isempty,A)) % index for non-empty cells Is there a way to find indexes for those who contain positive numbers only? Thanks btw using MatLab 2015a I simplified your arrays down so that A has three cells, and each cell contains one sub-cellarray which contains three numeric vectors of size 1x2. Hey, When I use cellfun, with a function that has arguments, I use repmat function to duplicate my arguments. Learn more about cellarray, cellfun, find . cellfun, arrayfun, structfun allow very compact code. Can't convert a cell array to a date using Learn more about datetime, datenum, cellfun, cell arrays MATLAB Select values from cell array with condition Learn more about cell arrays, cellfun 1) Assuming struct fields contain values as double, chararray, cellarray, or nested struct the following recursive function returns logical true if a NaN is found either as a double or as a string 'NaN': Learn more about cell, character, ischar MATLAB Hey, I need to check if my cell contains another cell or if the contant is a character vector. 4. Given Matlab's cellfun function, I am trying to use it instead of looping. If the cell array contains objects, cellfun does not call overloaded versions of the function fname. k{1} ans = 1×2 6 15 Input Arguments. Because cell arrays can contain a mix of types and sizes, you sometimes must extract and combine data from cells before processing that data. You can return A as a cell array when func returns values that cannot be concatenated into an array. %% T = table({'147956, 154414'; MATLAB Language Fundamentals Data Types Data Type Conversion. There's just no difference in what V or V(1) are; the latter is just a single cell of the former array. Fancy one-liner with two nested cellfuns and strfind at its core:. You can use Name,Value pair arguments with the input arguments cellfun('isempty') is much faster than cellfun(@isempty). Then, it performs strcmp and thus avoids cellfun or arrayfun, which might make it faster than earlier listed approaches. However, if you're really set on using B = arrayfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. C(idx) = {}; Regarding your specific In this code, cellfun applies the tryCatchFzero function to each element of xy, which contains your input pairs. 689111 seconds. Index = find (contains (C,'bla')); The function "contains" returns a logical array. I've got files which contain data multiple from multiple sensors. cellfun(@isnan, a, 'UniformOutput', false) ans = [ 0] [1x3 logical] [ 1] So how would I do this correct? Learn more about cellfun datestr . This is only necessary because some cells in my example are empty matrices, on which hi i have used this code <pre> indice = (find(cellfun(@(x) strcmp(x,'C:\user'),C))-330)<code> and it work for me. You can use Name,Value pair arguments with the input arguments Now I want to find out in which indices this contains NaN, so that I can replace these with '' (empty string). Each method was repeated 100,000 times and each iteration was timed using tic/toc. MATLAB Answers but just came across this and noticed Matlab didn't have a way of passing or implicitly expanding a parameter in Each of this string is the name of a test (20-MAG-C-Z1-S0A) and they have an indicator inside de name (S0A,S0B,S0C). I have a cell array which contains values 0 or 1. Use “isempty” and “cellfun” with the “find” function to find the empty cells. inputs = cellfun(@(varargin)varargin, varargin{:}, 'UniformOutput', false); The find array in cell using cellfun. chars e. But the mesh matrix size check if cell within cell array. Cellfun not working for cells contain cells?. This was for handles. You can use Name,Value pair arguments with the input arguments Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Learn more about MATLAB. Application of cellfun with multiple arguments. Try Teams for free Explore Teams Instead of using @mean, use @(x)mean(x,3), and as the others have mentioned - ,'UniformOutput',false. But being MATLAB they have to be 2d. 8. Each sensor has it's own Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about The cellfun function does not perform the calls to function func in a specific order. Please note that this approach would make more sense from Find indices in cell array. Sign in to comment. Learn more about cell, cellfun . 000000'; '100000. D = cellfun('fname', C) To convert the inner tuple elements, we can use cellfun. I am currently trying to remove all the NaN's from a large Cell Array I have 3806 x 122. edgeC = cellfun(@cell, edgeC, 'UniformOutput', false); myDataType = class(edgeC{1}) myDataType = 'cell' The You can create a logical array by checking if each element is numeric. Apply a function to each element in a cell array. @Andi Please see my above comment about using ~, it is the logical negation ("not") of the condition, i. I want to find columns which contains NaN (from empty cells in excel) and delete those columns. cellarray = cell(3,2); cellarray(:,1)= {[3, 2, 1]; [12, 3, 4, 6]; []}; edges = 1:13; % If you do not know the range of This works without relying on the array having a specific structure. cellfun then concatenates the outputs from func into the output array A, so that for the i th element of C, A(i) = func(C{i}). You can return B as a cell array I can loop around fields and create a temporary variable which contains {data. I'd like to provide a workaround but I'm not quite sure how to go about this. Column_Names = cell2table(Data_text); # What does the line "index=cellfun(@any,index);" do? Find the treasures in MATLAB Central and discover how the community can help you! Start Hunting! But it is expected, that loops are faster: cellfun and arrayfun are mex functions, which have to call the Matlab level for each element. I'm trying to use some kind of if-then-else statement in an anonymous function, which itself is part of cellfun. , is it a difference in the library functions they call for implementation?) The doc does contain some warnings if you have some fancy class you want to apply it to: If you specify a function name But the more important question is why you want to use cellfun for a more complex situation. If I use cellfun with isnan I get a useless output. But the function requires two inputs, one would be the cell array,A, and the Retrieving element index in spfun, cellfun, arrayfun, etc. Each structure in the Learn more about structfun(), cellfun() MATLAB Dear All, I want to avoid the use of for loops by using the structfun() and cellfun() commands. cellfun doesn't magically vectorize your code; If efficiency matters, it should be considered, than cellfun is slow when operating on anonymous functions. MATLAB Function Reference : cellfun. asked Jan 28, 2014 at 17:28. I want to look into this cell array and create an if statement that will allow me to distinguish between 2 types of messages. heterogeneous. Second, if you know how to use regexp expertly (this is not a dig - regexp is extremely powerful but even more difficult to master), you could do all of your checking with one expression. Since the results of the computation always have the same size (10x13), you can convert the resulting cell to a numeric array, if you reshape B to be a vector in the 3 rd dimension:C = cell2mat(reshape(B,1,1,[])); Now, if you also want to compute variance while In previous versions of MATLAB (before R2016b), you can use the “strfind” function. If pat is an array containing multiple patterns, then contains returns 1 if it finds any element of pat in str. Indexing of cell array using cellfun. Follow edited Jan 28, 2014 at 23:24. ('elem2'); data. cellstr( {'abc','def'} ) => {'abc','def'} strings e. g the data I am searching contains both 'Las Vegas, NV' and 'North First, your first solution is unnecessarily complicated. IndexC = strfind(C,'bla'); Index = find(not(cellfun('isempty',IndexC))) If you are searching for text that is exactly 'bla', then see Jos’ answer. Learn more about cell arrays, cellfun MATLAB I have a cell array (10x1) where each cell is a numeric array (Mx2) and a vector with key indicies. For each of them, I want to extrat the position of the Elapsed time is 0. Ive tried a few different versions of removing NaN, but it doesnt I am expanding the arrayfun code of the thread To Find Double Sequence With Transforms in Matlab? for a list of vectors in cellfun (DD). D = cellfun('fname',C) applies In that case, in order to put all these objects in an array, you will have to derive each class from matlab. I have been looking at solutions from similar problems, and I came up with. Learn more about string in cell array I have a cell array as attached, I want to find the row number which contains a specified string, such as 'bore', I know how to write a for-loop to compare the element one by one, but, is there an The cellstr function is your friend, since it converts all of the following to a cell array of chars:. A = cellfun(___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. You can use Name,Value pair arguments with the input arguments I'm writing a set of functions that will be used by colleagues who use older versions of MATLAB (2015a/2015b). Loops are very fast and very efficient. As the name of the function suggests, it will return true if the I have a cell array in Matlab, with each cell representing a financial transaction as a structure object (the cell array is earlier imported from a json file). I prefer loops. If you didn't know about function SIND (sine in degree) and wanted to convert the what ODE45 passes to the function it integrates from degree to radian, you could either write a function for this purpose (and create an M-File for that), or create an anonymous function How do I use cellfun to check numbers in a nx1 Learn more about cellfun . It is, though, well suited to returning substring locations, and if you have time it would be worth reviewing regexp() as a serious possibility. Learn more about cellfun, function, arguments MATLAB. DataName); indices = find(matches); % do some other stuff with the matches found, then move onto the This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. Let's say I have cell that contains 5 10x2 matrices, i. In Matlab how do I delete cells in a cell array that contains a varaible string. Cellfun() applies the function regimeNormalization individual to each cell of the cell For any input cell whose text does not contain 'bla', “strfind” returns an empty cell. clc; clear all; a=cell(3,3); for i=1:3 for j=1:3 a{i,j}=randi(10,[9 9]); end end row_sum_cell=cellfun(@(a) sum(a,2),a,'UniformOutput',false); For the first cell, the column contains 2018 and stack, therefore 1 and 0 are returned. This is only necessary because some cells in my example are empty matrices, on which histc behaves differently. The excel spreadsheet includes header (column title) and data. The image is useful but it would be nice not to have to simulate such a Lia = ismember(A,B,"rows") treats each row of A and each row of B as single entities and returns a column vector containing logical 1 (true) where the rows of A are also rows of B. ',B, 'uni', 0))),1) Perhaps the logical indices computed as intermediate result are of interest: How I would determine if a string contains Learn more about strings MATLAB, Text Analytics Toolbox. Hey guys! I am having trouble modifying these cell arrays to remove any NaN, string, or complex variables. However, “strfind” returns a cell array of indices. Examples. Anyway, when you write the function that cellfun() must use, it's often the same algorithm --it's just that with a for loop you need to enclose that code in a for loop instead of passing it to the cellfun() function. And one day I discovered the cellfun, which made the black magic quite simplier, I could change many loops working with cells and cellfun combo, but one day I saw one post about cellfun This MATLAB function applies the function func to the contents of each cell of cell array C, one cell at a time. Following my earlier thread "Modified the CELL'S column number into words", I had to change the data representation from CELL into TABLE type. If str is a string array or cell array, then TF is a logical array that is the same size as str. Learn more about cellfun, varfun, str2num, str2double, type conversion . icfhcqgvzxewnctanatkxpvukoxgbpruvixsljwadgoklitobtg