whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. I need to find index for string in structures when compare with required string. So for example if x is 'A2', you get as output, . cellfun is just like looping through the cell matrix and executing specified function separately on each cell. So far 1 L, and 1 T. Theme. *in2; end. Find strings within other strings - MATLAB strfind. Home . Choose a web site to get translated content where available and see local events and should return the index, correct me I am worng. You may receive emails, depending on your. I just wanted to jot down a few points about Matlab programming. Once yours is positioned between other answers, the readers will wonder what you are talking about. @mean. rows = find (cellfun (@ (c) ischar (c) && strcmp (c, lookup), yourcellarray)) %the && is essential to ensure that strcmp is only called when the content of the cell is a char vector. Reload the page to see its updated state. You're basically using a loop (. ) Arguments str1 and str2 may also be cell arrays of strings. I didn't look too closely at the details, I just substituted your strcmp for an ismember, tested it and left everything else as it was! How to change background color of Stepper widget to transparent color? Other MathWorks country At this step, it counts that L has shown up once, but since it was already counted so I don't want to count it again. you want - mean of the whole matrix content of the cell. is efficient, because it creates shared data copies only - this means that the actual strings are not duplicated. MatLab-Cellfunfunc=strcmpstr,matlab,cell-array,strcmp,Matlab,Cell Array,Strcmp,INDxMatlabcellfun Most likely you mean a cell string instead. For example, if my reference string is 'Gamma', and my cell array is {'Alpha','Beta','Gamma','Delta'}, then the result of the code should be 3. First, your first solution is unnecessarily complicated. Other MathWorks country write and read - its immediately clear what the call is In your specific case you could use cellfun this way: If you have thousands of cells and you want to do something Reload the page to see its updated state. When and why should I use cellfun in Matlab. auto-correlation in matlab; Using Globals instead of passing large arrays in Matlab; replacing a value in all columns with value of that column; suppress findpeaks warnings in MATLAB Signal Processing Toolbox; Matlab axis labels missing in all figures; MATLAB: Color of sphere distorts color scheme values why to pass 1 as argument for 'find' function. function output=MyFun (in1,in2) output=in1. The following code simulates a Lempel-Ziv source coding algorithm , it implements both encoding and decoding processes , the input data is a binary text with 1.00,000 bits generated randomly upon the program run and the output of the program code is the source generated code, what is the needed change in the code when the input data to the code becomes a binary text with 1,000,000 bits . If you're on anything more recent, go for the loops by default. cellfun is just like looping through the cell matrix and Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros. I don't want to use a "for-loop". What will the appropriate cellfun version of this be, and is it any better? Given Matlab's cellfun function, I am trying to use it instead of looping. matlabfindstrstrfind [Matlab] findstr,strfind,strmatch,strcmp,strncmp :strfind(A,B):(strfind(A,B)+lengthB-1) B A , C=ilovematlabmatlab: C = [A,B] + a=' The picture is ' b=' Ifstris a cell array of character vectors or a string array, thenstrfindreturns a cell array of vectors of typedouble. Sometimes a loop is faster. ya, it works !! I have a question regarding the cellfun function in MATLAB. Based on sites are not optimized for visits from your location. I do this by combining MATLAB and skills I acquired while doing my MSc. This gives me a 5x3 logical array, but is there a way to do it without calling each column individually? A = cellfun (func,C) applies the function func to the contents of each cell of cell array C, one cell at a time. Find the treasures in MATLAB Central and discover how the community can help you! But you could just as well write the loop yourself. It should also count that T has shown up once. The main screen of MATLAB will consists of the following (in order from top to bottom): Search Bar - Can search the documentations online for any commands / functions / class ; Menu Bar - The shortcut keys on top of the window to access commonly used features such as creating new script, running scripts or launching SIMULINK; Home Tab - Commonly used features/functions are grouped here I have lost trust in Stack Overflow executives. it's to find the first occurance of Lam1 in the cell array { LD(:).Name }, You may receive emails, depending on your. 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. executing specified function separately on each cell. Also simple to convert to a logical array: >> X = cellfun(@(c)strcmp(c,Event),Check, Another option which may or may not be faster than. Is MethodChannel buffering messages until the other side is "connected"? However, if I try to find indices that match more than one channel, I obtain an answer I cannot interpret. 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. We are receiving none of that, and for that reason I do not want to support Stack Overflow Inc. 17.10.2019 matlabfindstr,strfind,strcmp,strncmp - AI matlab strfind , (findstr) _ matlab strfind,Matlab strfind, regexp_ Matlab CellFunstrfind - IT- matlabfindstr,strfind,strcmp,strncmp. You also can call cellfun on a string array. There is a function for that in matlab: . When / why should I use it, and when may I just as well drop it? I have constructed advanced fighter-jets, mind control devices, a weather control device, a teleportation device, robots, clones, a working Transporter device from Star Trek, time machines, a Multiverse Transporter, a shrinking pod, as well as an assortment of guns including lasers, rocket launchers, and crossbows. I avoid corresponding programming errors by the simple convention: When it matters if a variable is a scalar entity or a list of objects: think that this is nicer, but avoiding sources of bugs is more important, especially because useful programs tend to grow. Oct 2016 - 11676. your location, we recommend that you select: . = true. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Accelerating the pace of engineering and science. Matlab CellFun strfind . That last option is what you see here. And btw., is it. in Electrical Engineering. Convert cell array of cells into cell array of strings in MATLAB, Sort MATLAB Cell Array Across multiple columns, Matlab: Converting a double vector array to string cell array, Read a whole text file into a MATLAB variable at once, MATLAB and cell array handling in for loop. If you want to look insie the inner cell arrays and only care about knowing which rows of the outer cell array may contain your search: Theme. When should i use streams vs just accessing the cloud firestore once in flutter? If you specify a function that returns text, then cellfun returns it as a cell array of character vectors, not as a string array. Therefore assuming your Channels is the, %first string of {'A1', 'A2', 'A3'} matches x (first string of Channels), %second string of {'A1', 'A2', 'A3'} matches x (second string of Channels), %third string of {'A1', 'A2', 'A3'} matches x (third string of Channels), call then convert that into a matrix that happens to be the identity matrix, and, The problem with the above is that you don't want a vector for each x, you just want one value that tells you whether or not. Unable to complete the action because of changes made to the page. So you could change the cellfun to: However, what you're now doing is testing the membership of one set into another. Here is all the code. Unable to complete the action because of changes made to the page. About me: https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#answer_216711, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#comment_356473, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#comment_356474, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#answer_216714, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#comment_356476, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#comment_356481, https://www.mathworks.com/matlabcentral/answers/277488-how-can-i-find-multiple-strings-in-a-cell-array#comment_595801. This gets even more important if the data is not of uniform size. instead of looping. I have a cell array of strings, called Channels, each containing an EEG channel label, e.g. doing. Here [C {:}] is a faster inlined version of cell2mat. (I can not make any statement on the contents of your or others' anwers), TabBar and TabView without Scaffold and with fixed Widget. 24. Other readers and you can profit from this information also. searchs for the first occurrence only, see. Scenario: someone writes some code using this function, and then one day it all stops working because the inputs just happened to be scalar that day and so this function outputs a numeric array instead of the expected cell array and . It's usually faster than doing the same thing explicitly It's usually faster than doing the same thing explicitly in loop, but the basic difference is that its easy to write and read - its immediately clear what the call is doing. So the simplest way to do your second comparison is simply with: Yes, that is true. MathWorks is the leading developer of mathematical computing software for engineers and scientists. page, answers can only be accepted by somebody else after 7 days of inactivity by the original author. : [Matlab] findstr,strfind,strmatch,strcmp,strncmp Matlab S1 S2 cell . matlab - . %instead of this. The order in which they are shown will not always be the same. I've tried doing something like this, (obviously not working): Welcome to SO! 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)\. For balance, I offer one (of many) ways to accomplish a non-weighted mean of all the elements of your cell by reshaping each matrix to a column array and concatenating them: I love using cellfun for plotting operations instead of looping, for example if I have multiple sets of sensor data and each set has multiple columns (because of multiple sensors per set) it's very convenient using. with a function handle, e.g. If you're on a Matlab version < 2006, go for the *fun functions by default. Using flutter mobile packages in flutter web. offers. MatLab - Cellfun where func = strcmp Find where str changes in a cell array Ask Question Asked 7 years, 6 months ago Modified 7 years, 6 months ago Viewed 2k times 0 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. sites are not optimized for visits from your location. for sure beats the loop version). I have suspended my activity network wide. Unable to complete the action because of changes made to the page. There is a function for that in matlab: ismember. to compare each individual string with 'A3'. I'm assuming there is some matrix way to do this. did you mark this question as Accepted Answer or did some one else mark it as if you had accepted it? Specifically, this is about finding a string within another cell array of strings, where the thing I'm really interested in is the index of the cell array where the reference string occurs. You can index like this: Theme Copy l {index1} (index2) 2 Comments Edited: James Tursa on 16 Jan 2017 strcmp does not accept: strcmp (Event, Check.') and this does not work also: Theme Copy ; having an uncontrollable special case is a bad way to write code. 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. L/T. is happy to directly compare a string with a cell array. You can index like this: l {index1} (index2) % ERROR! But in any case, you don't even need the loop since. So your first example could simply be: Now, in your second case, if you still were to use, for the comparison, you would indeed need, cell array into individual strings as you can't, two cell arrays together (expect if they're the same size but then it's a different behaviour). On one hand this is a little bit faster, if LD is really large. cellfun is just like looping through the cell matrix and executing specified function separately on each cell. More Answers (2) F. 0 Link Translate try this : 'once ) it's to find the first occurance of Lam1 in the cell array { LD (:).Name } 0 Link Translate Although strcmp shares a name with a C function, it does not follow the C language convention of returning 0 when the text inputs match. But you could just as well write the loop yourself. When you do, the output is a vector with 3 elements of either 0s or 1s, telling you respectively whether 'A1', 'A2', 'A3' matches x. : Are they strings or cell strings? Or a simpler using case - I have a cell array of data again and want to have a short view at it: That's it, one line, very fast in the command line. k = strncmp ('str1','str2',n) returns logical true ( 1) if the first n characters of the strings str1 and str2 are the same, and returns logical false ( 0) otherwise. offers. Please edit the answer so that it is clear what attempted solution/answer you are talking about. Based on LogA = false(numel(Event), numel(Check)); LogA(sub2ind(size(LogA), 1:numel(Event), loc.')) However, what you're now doing is testing the membership of one set into another. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. You may receive emails, depending on your. The people of the community need to feel heard, and their criticisms addressed. But you could just as well write the loop yourself. Based on your attempted solution, I imagine that the answers given will solve your problem. For compatibility, cellfun treats each element of a string array as though it were a character vector. Based on Find the treasures in MATLAB Central and discover how the community can help you! I'd like to find indices that correspond to a subset of the strings. in plural? The legend is displayed for each data set only (note: this could also be done by using hggroups). This example plots all datasets, each dataset in it's own color and each sensor per dataset with an other linestyle. Using your matrices. Well, it's Marc's question, why don't you let Marc decide? The accepted solution is equivalent to the right side of the above equation, but the original implementation is (obviously) equal to the left side. Either could be correct given your needs. cellfun is already slower than calling a simple loop, yet this potentially doubles the runtime. i.e., what if I had 100 strings I wanted to check for and the goal was to have a 5x100 logical array? However, it appears to me your solution will weight some values more than others and may not be valuable to all readers. https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420457, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#answer_250374, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420114, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420459, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#answer_250467, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#answer_250434, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420123, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420132, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420301, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420331, https://es.mathworks.com/matlabcentral/answers/320189-using-strcmp-on-multiple-strings-to-get-a-logical-array#comment_420541. Best coding solution for query MatLab - Cellfun where func = strcmp Find where str changes in a cell array. Create abbreviations for names in a string array using cellfun. The strcmp function is intended for comparison of text. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. For a single string, I've found the following works: Match=cellfun(@(x) strcmp({'A3'}, x), Channels, 'UniformOutput', 0);r=find(cell2mat(Match)). [Matlab]strfind , :ai52learn@foxmail.com. Choose a web site to get translated content where available and see local events and Findstr findstr [/b] [/e] [/l] [/r] [/s] [/i] [/x] [/v] [/n] [/m] [/o] [/p] [/offline] [/g:File] [/f:File] [/c:String] [/d:DirLi matlab strfind,Matlab strfind, regexp strfind cell Syntax start = regexp(str,expr) [start,fi ind=findstr(str,''');strfindfindstrstrfind. Description. To any other reader, if you find this answer of any help please click on the thumbs-up vote link, There is no advantage in converting the strings to doubles, because. Other MathWorks country @John BG: Marc can still decide, even if he knows why your solution in not efficient. When I started working with matlab sometime ago in the university, my supervisor would kill me if he saw any unnecessary for loop (he would ask for exchanging it for kron or any type of indexes manipulation as possible). ): to each of them you either use a loop or a cellfun Here I will find the index for string residing in LD(:).Names, is their any easy way to find the index using cellfun, I tried like this cellfun(@strcmp,'Lam1',LD(:).Names). If you mean minimum execution time, well, sometimes *fun are faster (for example, cellfun ('isempty', . in loop, but the basic difference is that its easy to Reload the page to see its updated state. 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}). Find the treasures in MATLAB Central and discover how the community can help you! A simple example: Let's say I have a cell a, and I want to find the average of all values in a. However, cellfun is probably what you're looking for: This produces a cell array the size of Check with logical arrays the size of Event. of 'A1', 'A2', 'A3' matches x. MathWorks ist der fhrende Entwickler von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler. How to check if widget is visible using FlutterDriver. ); (yes, string argument!) The values should be 1, 2, 3. When you're comparing individual strings with each others, returns a scalar, so you don't need to have, would be a matrix and you wouldn't need the subsequent, either. your location, we recommend that you select: . No need for cellfun or arrayfun: index = find (strcmp ('Lam1', {LD.Name}), 1); {LD.Name} is efficient, because it creates shared data copies only - this means that the actual strings are not duplicated. what actually happening in side can you brief me. It's usually faster than doing the same thing explicitly in loop, but the basic difference is that its easy to write and read - its immediately clear what the call is doing. Another great use case is compressing higher dimensional data numerical data by using mean(), max(), min(), std() and so on, but you've mentioned this already. Choose a web site to get translated content where available and see local events and More Answers (2) Guillaume on 13 Jan 2017 3 Link Edited: Guillaume on 13 Jan 2017 Another option which may or may not be faster than cellfun (. For case-insensitive text comparison, use strcmpi instead of strcmp. offers. r=1, 5, 9, which is incorrect. your location, we recommend that you select: . I want to check for the occurrence of 3 possible events in a series of events.. . with an anonymous function. The input argument func is a function handle to a function that takes one input argument and returns a . if you find these lines useful would you please mark my answer as Accepted Answer? to be understood as x so that mean(x(:)) gives you what If used on unsupported data types, strcmp always returns 0. On the other hand it replicates the behaviour of your function, which breaks after the first occurence also. If all 2nd halves of the strings contained in Event is '1', it is reasonable to ignore the entire column: Occurence of events are listed in variable occ, meaning occ contains the occurrences: a1 b1 a1 c1 b1. https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#comment_88580, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#comment_88597, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#answer_52978, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#comment_88578, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#comment_88600, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#answer_52974, https://de.mathworks.com/matlabcentral/answers/43087-need-to-use-cellfun-for-returning-index-of-array#answer_52976. sites are not optimized for visits from your location. Accelerating the pace of engineering and science. BTW: @(x) means that you want the content of each cell Match = cellfun (@ (x) any (strcmp ( {'A1', 'A2', 'A3'}, x, Channels); r = find (Match); Note that again you don't need the 'UniformOutput', false and the cell2mat call since the output of cellfun is now scalar. strfind.m matlab , , join ( [Matlab]strfind :10 ! I appreciate you time, feedback, and comments. How to store string matrix and write to a file? The value of r is 3, which is what I would expect. How would you create a standalone widget from this widget tree? This is the case where numel(a{1}) ~= numel(a{2}). For example, Match=cellfun(@(x) strcmp({'A1','A2','A3'}, x), Channels, 'UniformOutput', 0);r=find(cell2mat(Match)). There's really nothing wrong with a for loop in this case. Alternative: Theme Copy index = cellfun (@ (x) x==5, C, 'UniformOutput', 1); Or the long and most likely faster form: Theme Copy index = false (1, numel (C)) for k = 1:numel (C) index (k) = (C {k} == 5); end [EDITED] If you are talking of a cell string, this is much faster: Theme Copy Later on, I was trying to avoid as much as possible any loop on matlab, searching for the darkest matlab coding ways to do black magic instead of a simple loop. TF = strncmp (S,T,N) where either S or T is a cell array of strings, returns an array TF the same size as . 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