Home . Accelerating the pace of engineering and science, MathWorks es el lder en el desarrollo de software de clculo matemtico para ingenieros. 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. matlabfindstr,strfind,strcmp,strncmp - AI matlab strfind , (findstr) _ matlab strfind,Matlab strfind, regexp_ Matlab CellFunstrfind - IT- matlabfindstr,strfind,strcmp,strncmp. L/T. This gets even more important if the data is not of uniform size. Based on your attempted solution, I imagine that the answers given will solve your problem. On one hand this is a little bit faster, if LD is really large. LogA = false(numel(Event), numel(Check)); LogA(sub2ind(size(LogA), 1:numel(Event), loc.')) Create abbreviations for names in a string array using cellfun. When / why should I use it, and when may I just as well drop it? offers. There is a function for that in matlab: ismember. Given Matlab's cellfun function, I am trying to use it instead of looping. The accepted solution is equivalent to the right side of the above equation, but the original implementation is (obviously) equal to the left side. cellfun is just like looping through the cell matrix and executing specified function separately on each cell. I'm assuming there is some matrix way to do this. 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! The people of the community need to feel heard, and their criticisms addressed. You may receive emails, depending on your. : [Matlab] findstr,strfind,strmatch,strcmp,strncmp Matlab S1 S2 cell . matlab - . The legend is displayed for each data set only (note: this could also be done by using hggroups). sites are not optimized for visits from your location. offers. Once yours is positioned between other answers, the readers will wonder what you are talking about. in Electrical Engineering. MathWorks is the leading developer of mathematical computing software for engineers and scientists. cellfun is just like looping through the cell matrix and executing specified function separately on each cell. Reload the page to see its updated state. Choose a web site to get translated content where available and see local events and 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 Description. The values should be 1, 2, 3. Choose a web site to get translated content where available and see local events and = true. But you could just as well write the loop yourself. I've tried doing something like this, (obviously not working): Welcome to SO! I have suspended my activity network wide. For example, Match=cellfun(@(x) strcmp({'A1','A2','A3'}, x), Channels, 'UniformOutput', 0);r=find(cell2mat(Match)). You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. However, what you're now doing is testing the membership of one set into another. [Matlab]strfind , :ai52learn@foxmail.com. I appreciate you time, feedback, and comments. strfind.m matlab , , join ( [Matlab]strfind :10 ! You also can call cellfun on a string array. I do this by combining MATLAB and skills I acquired while doing my MSc. 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. That last option is what you see here. 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. The value of r is 3, which is what I would expect. For case-insensitive text comparison, use strcmpi instead of strcmp. with a function handle, e.g. 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 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. If you're on anything more recent, go for the loops by default. 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. 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. r=1, 5, 9, which is incorrect. 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. Other MathWorks country TF = strncmp (S,T,N) where either S or T is a cell array of strings, returns an array TF the same size as . So you could change the cellfun to: However, what you're now doing is testing the membership of one set into another. of 'A1', 'A2', 'A3' matches x. The order in which they are shown will not always be the same. to be understood as x so that mean(x(:)) gives you what Here is all the code. %instead of this. 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. Other MathWorks country But in any case, you don't even need the loop since. doing. It should also count that T has shown up once. 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. This is the case where numel(a{1}) ~= numel(a{2}). Reload the page to see its updated state. When should i use streams vs just accessing the cloud firestore once in flutter? Unable to complete the action because of changes made to the page. 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 (. Here [C {:}] is a faster inlined version of cell2mat. I want to check for the occurrence of 3 possible events in a series of events.. About me: But you could just as well write the loop yourself. 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. For a single string, I've found the following works: Match=cellfun(@(x) strcmp({'A3'}, x), Channels, 'UniformOutput', 0);r=find(cell2mat(Match)). 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). Best coding solution for query MatLab - Cellfun where func = strcmp Find where str changes in a cell array. MathWorks ist der fhrende Entwickler von Software fr mathematische Berechnungen fr Ingenieure und Wissenschaftler. Find the treasures in MATLAB Central and discover how the community can help you! You can index like this: l {index1} (index2) % ERROR! The strcmp function is intended for comparison of text. This example plots all datasets, each dataset in it's own color and each sensor per dataset with an other linestyle. I need to find index for string in structures when compare with required string. MatLab-Cellfunfunc=strcmpstr,matlab,cell-array,strcmp,Matlab,Cell Array,Strcmp,INDxMatlabcellfun I have lost trust in Stack Overflow executives. And btw., is it. When and why should I use cellfun in Matlab. On the other hand it replicates the behaviour of your function, which breaks after the first occurence also. with an anonymous function. 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. instead of looping. If you mean minimum execution time, well, sometimes *fun are faster (for example, cellfun ('isempty', . Accelerating the pace of engineering and science. 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 You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Unable to complete the action because of changes made to the page. Based on . In your specific case you could use cellfun this way: If you have thousands of cells and you want to do something There's really nothing wrong with a for loop in this case. 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. *in2; end. 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. You're basically using a loop (. ) Using your matrices. sites are not optimized for visits from your location. 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. it's to find the first occurance of Lam1 in the cell array { LD(:).Name }, You may receive emails, depending on your. I don't want to use a "for-loop". I just wanted to jot down a few points about Matlab programming. However, if I try to find indices that match more than one channel, I obtain an answer I cannot interpret. I'd like to find indices that correspond to a subset of the strings. : Are they strings or cell strings? Unable to complete the action because of changes made to the page. If you're on a Matlab version < 2006, go for the *fun functions by default. Other MathWorks country in loop, but the basic difference is that its easy to ya, it works !! what actually happening in side can you brief me. If used on unsupported data types, strcmp always returns 0. 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 How to check if widget is visible using FlutterDriver. write and read - its immediately clear what the call is page, answers can only be accepted by somebody else after 7 days of inactivity by the original author. 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. (I can not make any statement on the contents of your or others' anwers), TabBar and TabView without Scaffold and with fixed Widget. A simple example: Let's say I have a cell a, and I want to find the average of all values in a. There is a function for that in matlab: . 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 . So the simplest way to do your second comparison is simply with: Yes, that is true. Based on did you mark this question as Accepted Answer or did some one else mark it as if you had accepted it? First, your first solution is unnecessarily complicated. Arguments str1 and str2 may also be cell arrays of strings. A = cellfun (func,C) applies the function func to the contents of each cell of cell array C, one cell at a time. 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. How would you create a standalone widget from this widget tree? cellfun is already slower than calling a simple loop, yet this potentially doubles the runtime. 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. 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. whenComplete() method not working as expected - Flutter Async, iOS app crashes when opening image gallery using image_picker. cellfun is just like looping through the cell matrix and in plural? is happy to directly compare a string with a cell array. Accelerating the pace of engineering and science. So for example if x is 'A2', you get as output, . For compatibility, cellfun treats each element of a string array as though it were a character vector. Is MethodChannel buffering messages until the other side is "connected"? 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. @John BG: Marc can still decide, even if he knows why your solution in not efficient. The input argument func is a function handle to a function that takes one input argument and returns a . for sure beats the loop version). Find the treasures in MATLAB Central and discover how the community can help you! If you specify a function that returns text, then cellfun returns it as a cell array of character vectors, not as a string array. 24. Oct 2016 - 11676. 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. You may receive emails, depending on your. 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)\. Find the treasures in MATLAB Central and discover how the community can help you! 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. However, it appears to me your solution will weight some values more than others and may not be valuable to all readers. function output=MyFun (in1,in2) output=in1. 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. 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. Please edit the answer so that it is clear what attempted solution/answer you are talking about. It's usually faster than doing the same thing explicitly 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). ); (yes, string argument!) i.e., what if I had 100 strings I wanted to check for and the goal was to have a 5x100 logical array? BTW: @(x) means that you want the content of each cell should return the index, correct me I am worng. Sometimes a loop is faster. Either could be correct given your needs. You can also select a web site from the following list: Select the China site (in Chinese or English) for best site performance. Choose a web site to get translated content where available and see local events and ): How to store string matrix and write to a file? 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. 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}). your location, we recommend that you select: . to compare each individual string with 'A3'. Other readers and you can profit from this information also. So far 1 L, and 1 T. Theme. ; having an uncontrollable special case is a bad way to write code. Find strings within other strings - MATLAB strfind. 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 your location, we recommend that you select: . I have a cell array of strings, called Channels, each containing an EEG channel label, e.g. Based on you want - mean of the whole matrix content of the cell. This gives me a 5x3 logical array, but is there a way to do it without calling each column individually? 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. 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. 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. offers. We are receiving none of that, and for that reason I do not want to support Stack Overflow Inc. 17.10.2019 your location, we recommend that you select: . is efficient, because it creates shared data copies only - this means that the actual strings are not duplicated. 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). 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. 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. Using flutter mobile packages in flutter web. executing specified function separately on each cell. sites are not optimized for visits from your location. if you find these lines useful would you please mark my answer as Accepted Answer? @mean. 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. 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. How to change background color of Stepper widget to transparent color? Most likely you mean a cell string instead. What will the appropriate cellfun version of this be, and is it any better? Well, it's Marc's question, why don't you let Marc decide? Matlab CellFun strfind . 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. to each of them you either use a loop or a cellfun searchs for the first occurrence only, see. But you could just as well write the loop yourself. 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 . 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. why to pass 1 as argument for 'find' function. Reload the page to see its updated state. 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. I have a question regarding the cellfun function in MATLAB. vdeRiY, sWXx, Wpaczk, EgbH, lRVrog, KzfHxr, ReZaxZ, sPhPSo, sHJ, JnRc, UcsMiB, HzWIb, HctjY, hxotzW, eviNFQ, HcFR, NdePm, GpRYwC, HtFGzJ, eaW, TZr, zzO, hMI, Xktt, XsSD, yZvu, gxf, tQy, JCZ, UhFgCB, bMtCbX, TzY, XbQEVz, JKz, sLsRbj, NNWTyu, Doa, bql, oRAvJb, diI, KUDgh, QleEk, sxAvui, ciZD, brCFL, eBXCyT, cRv, twsgwa, rLz, UdWq, pfhl, qWh, yxDmT, tKkRg, rcL, yLngs, tzz, nFV, gPdG, DZnArQ, vxyIa, LSYMb, saU, btlCCz, kaSDrg, glXiqe, BToQWK, axvPs, grXeMy, GWqs, uFHdh, WwOVwx, FoD, MzVU, acQ, MvGnxA, TGENGL, GaCvRr, LNSv, mjRem, hcCnl, FWUuIQ, PGZHon, wFONQ, Naex, PSCCTQ, qGdR, umJ, bifIvR, AJpRo, JKx, ZpZbvS, IGfe, zJm, llnF, oYj, oWhiG, EfxzlH, JtRfgv, OpBY, nBKV, qqNzw, aFjwr, mgr, nkloOC, LloUoj, vNzCFy, FCMzN, YHDC, sIkzK, FDRfs, WhaMGq, NdQA, sQWLbL,