https://www.mathworks.com/matlabcentral/answers/811680-understanding-the-structfun-or-cellfun-commands, https://www.mathworks.com/matlabcentral/answers/811680-understanding-the-structfun-or-cellfun-commands#answer_683380, https://www.mathworks.com/matlabcentral/answers/811680-understanding-the-structfun-or-cellfun-commands#comment_1479700, https://www.mathworks.com/matlabcentral/answers/811680-understanding-the-structfun-or-cellfun-commands#comment_1479950, https://www.mathworks.com/matlabcentral/answers/811680-understanding-the-structfun-or-cellfun-commands#answer_683860. @excaza I have that setup because that's how my boss stores the results of the experiment. 1 You can create a logical array by checking if each element is numeric. Matlab's built-in cellfun function has traditionally enabled several named (string) processing functions such as 'isempty'. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. I have a cell array called myCellArray. Or, if you can't manage it in one line, use a handle to the m-file function you write. Why is the federal judiciary of the United States divided into circuits? offers. The relevant code would look like this: data = cellfun ('isempty',cellArray); In recent years, newer Matlab releases has added support for function handles . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. your location, we recommend that you select: . MyCellArrayNotCalledC_output = cellfun(@(whateveryoulike) datestr(whateveryoulike. MATLAB: How to use cellfun with a struct? Why would Henry want to close the breach? How do I arrange multiple quotations (each with multiple lines) vertically (with a line through the center) so that they're side-by-side? MathWorks is the leading developer of mathematical computing software for engineers and scientists. Should I call it something else? temptemp is 1 X 44 cell : every cell is 1 X 3130 array double. sf = @ (y) structfun (@ (x) x (1:2), y, 'UniformOutput',false); cellfun (sf, foo, 'UniformOutput', false); You can do this in one line as below. offers. MathWorks is the leading developer of mathematical computing software for engineers and scientists. My cell array, foo, is a "1x4 struct array with fields: a b c d" is what Matlab says. I'm trying to use the function datestr on a cellmatrix using the option 'local'. with an anonymous function. Such as. option. Otherwise the command. Connect and share knowledge within a single location that is structured and easy to search. D = cellfun ('fname', C) applies the function fname to the elements of the cell array C and returns the results in the double array D. Each element of D contains the value returned by fname for the corresponding element in C. The output array D is the same size as the cell array C. D = cellfun ('size', C, k) returns the size along . ), X_in (mask), 'uniform', 0); Kaushik Lakshminarasimhan Why do you have a cell array of structs in the first place? For multichannel members, custom autolabeling functions get data and time values as matrices or cell arrays. If you have only one row, you can remove any(,1) (although the general answer will also work): Thanks for contributing an answer to Stack Overflow! You cannot inline structfun like that. Anonymous functions are a powerful tool of the MATLAB language. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. "Obviously my cellarray isn't called C either", x is just the name of a variable. But, for illustration, 3b) As the above illustrates, you write an anonymous function in place of the function handle--it can be any one-line expression. I thought the function itsself was called x. I understand now. 3) Could I still use a cellfun() to get the numbers in front of the file name? So the function would 'apply' B to each cell within A and output the resultant arrays into another cell array your location, we recommend that you select: . Find the treasures in MATLAB Central and discover how the community can help you! It will automatically repeat this action on all elements in the cell-array string. Making statements based on opinion; back them up with references or personal experience. cellfun will apply your function to the contents of you cell array. Unable to complete the action because of changes made to the page. ", The anonymous function in Guillaume's answer is not named anything, nor is it allocated to any named variable: it is simply provided as the first argument to, . The workaround is mask = cellfun (@ (y) y>2, Y); X_out = X_in; X_out (mask) = cellfun (@ (xin) reshape (xin, . Obviously my cellarray isn't called C either "Is it good practise to call the anonymous function x? Does aliquot matter for final concentration? How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? where the Files struct is embedded in the anonymous function. If you couple please enlighten me on this regard. You need to create a temporary function handle which calls structfun and use that in cellfun. Applying custom function to each cell in matrix (or cell array)? in a scalar struct; you have a struct array -- not what you want. Where does the idea of selling dragon parts come from? You need to create a new function that only takes one input argument (the cell array element) and then call datestr with that argument and the 'local' option. Does aliquot matter for final concentration? Why was USB 1.0 incredibly slow even for its time? Thanks! It is of size 1 x 1500. So the function would 'apply' B to each cell within A and output the resultant arrays into another cell array Theme Copy Does balls to the wall mean full speed ahead or full speed ahead and nosedive? Here is a matrix on the left which contains with 2 cell members. You can do this in one line as below. )^*T operation for complex numbers. Your code has issues. Why is Singapore currently considered to be a dictatorial regime and a multi-party democracy by different publications? If we know that an output will not be regular, it must be saved in cell. with a function handle, e.g. offers. Accelerating the pace of engineering and science. This was for handles. FileNames = structfun (@ (x) Files (x).name, Files); % Create cell array of the file names nnn = cellfun (@ (x) sscanf (FileNames {x},'%d_M'),FileNames); % Create double array of file prefixes The 2nd and 3rd lines give me errors, repectively: Theme Copy Error using structfun Inputs to STRUCTFUN must be scalar structures. your location, we recommend that you select: . Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. sites are not optimized for visits from your location. I want to apply a function to every cell within a cell array, so using cellfun seems the logical way to go. For example: I want to understand how to use an arbitrary function inside the cellfun() command to be able to use them in the future. The first argument to. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Avoiding CELLFUN or STRUCTFUN is simpler and much more efficient: You may receive emails, depending on your. Matlab code to calculate horizontal and vertical offset amount of two images; How to calculate signed and unsigned Gradient orientations in Matlab; Matlab Function Performance - Too many loops; debug matlab function called from c#; MATLAB xlsread's cell range changing on each loop; Is there a way to make an existing cmd window execute commands? The third and fourth parameters are optional but important. MATLAB : PROBLEM WITH CELLFUN AND TWO VARIABLES FUNCTION. To learn more, see our tips on writing great answers. Theme Copy %instead of this If that helped, I will post my comment as answer for future reference. E.g. You need to create a temporary function handle which calls structfun and use that in cellfun. If you are asking about that input argument, then you can rename it if you want to. I have a 4-cell array each with a struct that contains one vector (going to be multiple vectors once I figure this out), and I want to resize each vector from index1 to index2. % When using the correct 'FileNames' the for loop gives. This can be done all in one go with an anonymous function: Thanks mate, one more question. Dual EU/US Citizen entered EU on US Passport. Based on Disconnect vertical tab connector from PCB. Based on Should add I'm trying to extract features for 118 images. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. However, they do not exist on the MATLAB path like a regular function would, e.g. I want to simulate every network with the relative array double : The code doesn't return errors but in vectorized mode it uses always the first network for all . What is the highest level 1 persuasion bonus you can have? So the function would 'apply' B to each cell within A and output the resultant arrays into another cell array Theme Copy My data are in the form of a cell array of structs. As Stephen's said, an anonymous function, by definition, has no name. Functions operate on variables within their own workspace, which is also called the local workspace, separate from the workspace you access at the MATLAB command prompt which is called the base workspace. Reload the page to see its updated state. - MATLAB Answers - MATLAB Central Applying custom function to each cell in matrix (or cell array)? They are functions that exist locally, that is: in the current workspace. Is wrapping the function with the {} operator a valid replacement of 'UniformOutput', false in cellfun? But the function requires two inputs, one would be the cell array,A, and the other is B, a 41x1 matrix. Did neanderthals need vitamin C from the diet? Reload the page to see its updated state. Thus I want to do something like the following C = {'GBP_USD', 'GBP_AUD', 'USD_CAD'} A = cellfun (chart_funcv,C) This fails with error Not enough input arguments. To learn more, see our tips on writing great answers. But the function requires two inputs, one would be the cell array,A, and the other is B, a 41x1 matrix. Why does Cauchy's equation for refractive index contain only even power terms? But it is better to keep this in two lines for readability. https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#answer_297159, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#comment_518301, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#comment_518318, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#comment_518319, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#comment_518327, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#comment_518379, https://www.mathworks.com/matlabcentral/answers/373916-calling-a-function-option-using-cellfun#answer_828529. only knows to grab the first file's name? Function call with variable number of input arguments when number of input arguments is not explicitly known. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Where does the idea of selling dragon parts come from? It looks clunky, but the following also works for parameters, passing constants, etc., as additional cell arrays without calling an anonymous function, which has a bit of a performance penalty (understanding the memory impact this could imply for very large cell arrays). Thank you for helping me understand these functions! Is it good practise to call the anonymous function x? I'll update my post, I gave a general answer assuming you had several rows, but it'll work too with just one. Other MathWorks country This can be done all in one go with an anonymous function: Theme Copy C = cellfun (@ (x) datestr (x, 'local'), C, 'UniformOutput', false); 5 Comments Guillaume on 21 Dec 2017 Is it possible to hide or delete the new Toolbar in 13.1? Thank you dpb for the answer, which does work as needed. And then use this to perform your cellfun operation on the subset of the cell array that contains numeric data. The problem I'm having is that the inputs are both cell arrays which doesn't allow me to put one of them as the cell array. I want to avoid the use of for loops by using the structfun() and cellfun() commands. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Unable to complete the action because of changes made to the page. You can rename it to any other valid variable name, like. It seems like the function was doing something but the indexing was incorrect? ie. When would I give a checkpoint to my D&D party that they can return to if they die? How does legislative oversight work in Switzerland when there is technically no "opposition" in parliament? Multiple inputs and custom functions X = cellfun (@ (x) myfunction (x,y) , CellArray) Example - Customized function % define custom function function c = myfunction (s,th) % convert string into numerical value and check if larger than threshold 'th' x = str2num (s); if isempty (x), x=NaN; end c = x > th; 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. Find the treasures in MATLAB Central and discover how the community can help you! How can I write a MATLAB function named kellen that takes three input arguments named trs, ch1,ch2? Would like to stay longer than 90 days. This syntax returns logical 0 ( false) for objects that are a subclass of classname. Other MathWorks country A couple follow up comments/ questions if I may: 1) I learned that the {} around Files.name creates the cell array of the file names. My work as a freelance was used in a scientific paper, should I be included as an author? You may receive emails, depending on your. MOSFET is getting very hot at high frequency PWM. cellfun(@sum, abc, num2cell(2*ones(size(abc))). Can't change that, unfortunately. % and You want to avoid loops; is a loop in sheep's clothing; underneath it is the loop with more overhead than just the direct, construct. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? A = cellfun ( ___,Name,Value) applies func with additional options specified by one or more Name,Value pair arguments. Matlab : (. Not the answer you're looking for? What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? I'm trying to specifically use cellfun to use the function extractFeatures on multiple detected points from a SURF detection in the computer vision toolbox. What does your cell array of structs look like? And, for the specific desire you don't need either function nor a loop construct, either -- use MATLAB vectorized notation--. works for cell arrays, taking the contents of each cell in turn; Asking for help, clarification, or responding to other answers. NB: one feature of anonymous functions is that the embed any workspace variables not in their argument list in the function body itself -- the same result as above could be obtained by. cellfun (MATLAB Functions) cellfun Apply a function to each element in a cell array Syntax D = cellfun ('fname',C) D = cellfun (' size ',C,k) D = cellfun ('isclass',C, classname ) Description D = cellfun ('fname',C) applies the function fname to the elements of the cell array C and returns the results in the double array D. That is why they are called anonymous, although they can have a name like a variable in the workspace. Please advise Accepted Answer Cedric Wannaz on 8 Oct 2017 8 Link Find centralized, trusted content and collaborate around the technologies you use most. Asking for help, clarification, or responding to other answers. 3a) Sure, but why? Please advise Accepted Answer Cedric Wannaz on 8 Oct 2017 8 Link Translate Each of a,b,c,d, is a 10x1 vector. This must be point out setting false to UniformOutput. Why would Henry want to close the breach? I persist with an array of structs instead of a struct of arrays partly because of. Do bracers of armor stack with magic armor enhancements and special abilities? Now we can create a handle on a function that we don't name (anonymous). Can we keep alcoholic beverages indefinitely? The function takes 6 inputs, however i wish to use CELLFUN so as to input an array of the first input. The reason I need to {} is to create the array? @mean with an anonymous function That last option is what you see here. Why do quantum objects slow down when volume increases? Reload the page to see its updated state. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Description. My goal is to create a double array of the "nnn" values. You cannot inline structfun like that. It usually takes two parameters: a function handle as the first parameter and an array. I have a folder with a bunch of "nnn_M.csv" files, where the "nnn" prefix corresponds to numbering of the files, and the "_M" suffix being constant for all files. But it is better to keep this in two lines for readability. Thus I want to do something like the following C = {'GBP_USD', 'GBP_AUD', 'USD_CAD'} A = cellfun (chart_funcv,C) This fails with error Not enough input arguments. There are 3 ways to specify the function: as a char array (only a handfull of functions, but they are faster when called like this)\ with a function handle, e.g. P.S. cellfun will apply your function to the contents of you cell array. @mean with an anonymous function That last option is what you see here. But the function requires two inputs, one would be the cell array,A, and the other is B, a 41x1 matrix. A = cellfun ('isclass', C, classname) returns logical 1 ( true) for each element of C that matches the classname argument. Link. realize it's been a few years, but just came across this and noticed Matlab didn't have a way of passing or implicitly expanding a parameter in cellfun (except for a very few specific functions as mentioned in the help). Choose a web site to get translated content where available and see local events and in an m-file. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. 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? The name of the file and of the function should be the same. sites are not optimized for visits from your location. What does the exclamation mark do before the function? The code I currently use with a for loop: (Works), % Create the structure of file descriptions (name,datenum,), This is the code without a for loop: (Does not work). Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Modify struct array and return struct array, var functionName = function() {} vs function functionName() {}, Set a default parameter value for a JavaScript function. Should I exit and re-enter EU with my EU passport or is it ok? 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 inline, directly in the call to . tempwmul is 1 X 44 cell : every cell is 1 X 1 trained network. I welcome all suggestions you may have. Follow 27 views (last 30 days) Show older comments amanda on 30 Mar 2012 I have a matrix whose elements are all generated by the random number generator function, rand. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. What happens if you score more than 99 points in volleyball? I have a matrix whose elements are all generated by the random number generator function, rand. Thanks in advance. Snap shot below (please note the column numbers are not part of myCellArray was just to hopefully help highlight the answer vector I wanted returned). What properties should my fictional HEAT rounds have to punch through heavy armor and ERA? MathWorks is the leading developer of mathematical computing software for engineers and scientists. I believe I'd use cellfun(@func, A) but I'm unsure how to set up the @func correctly since I've always used matrices/vectors and never cell arrays. 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