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Problem understanding this "for" loop
Before the loop xx is pre-allocated to the maximum number of iterations. The for loop runs from 1 until MAXITER. The variable o...

presque 4 ans il y a | 1

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How to to add column 3rd+4th, 6th+7th and 9th+10th from a 8x12 matrix?
C1 = B(:, 3) + B(:, 4); C2 = B(:, 6) + B(:, 7); C3 = B(:, 9) + B(:, 10); Or maybe: C = B(:, [3,6,9]) + B(:, [4,7,10])

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How to filter out files with a list of specific string in UIGETFILE command?
As far as I can see, the file pattern [x] is not implemented in uigetfile: xlsfile = uigetfile('EF[AI]*.xls', 'Select Excel fil...

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Hold on and Hold off command keeps all plots on subsequent graphs
clear clears the variuables of the workspace. clc clears the command window. Both do not have any connection to the state of the...

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Compiled mex file raises memory issue
Avoid using int as dimensions. Call mxCreateNumericArray as explained in the documentation: mxArray *mxCreateNumericArray(mwSiz...

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How to prevent triggering 'SizeChangedFcn' callback too many times?
See this solution: https://www.mathworks.com/matlabcentral/answers/570829-slow-sizechangedfcn-or-resizefcn#answer_475105

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Analyzing different sections of an array
Either reshape the array: x = rand(20, 100); y = reshape(x, 20, 10, 10); m = mean(x, 2); % If you want the mean value over b...

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How to perform svd without using the inbuilt function?
You can find working solutions in the FileExchange: https://www.mathworks.com/matlabcentral/fileexchange/12674-simple-svd htt...

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How do I take audio from Youtube and play it on Matlab?
As far as I know you cannot extract the sound directly in Matlab. Use an external tool like youtube-dl .

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uninstalling old version error
If the installation is corrupted, the uninstallation can fail. Then install this version again overwriting the existing installa...

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Subtracting a value in a 3D array with all values in another 3D array
A = rand(5,6,7); B = rand(6,7,8); D = min(A(:).' - B(:), [], 1); Result = reshape(D, size(A)); If the intermediate matrix A(...

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How to determine how many random numbers were generated, using Mersenne twister?
The direct solution is to modify the function joeblow1 and joeblow1 such, that they count the created random numbers. Another o...

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how i can fix the problem of isPrimitiveRoot ?
Open the documentation: doc isprimitiveroot or online: https://www.mathworks.com/help/symbolic/isprimitiveroot.html Scroll d...

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How to extract data from this chunk of data
c = '77es-78es-79es-79es-80es-81es-82es-83es-144es-145es-146es-147es-1'; m = strfind(c, 'es'); d = c(m(1):m(end)-1); d = st...

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Unrecognized function or variable 'lof'.
Do you have the Statistics and Machine Learning Toolbox installed and licensed? If not, you cannot access functions of this tool...

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How to make a while loop to repeat multiple times with different values of variable?
Simply add a loop to modify q: for q = 0.5:4 t_in_before=19; t_out=-1; time = 0; while t_in_before > 5 ...

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Unable to perform assignment because the size of the left side is 1-by-3 and the size of the right side is 7-by-3.
"Unable to perform assignment because the size of the left side is 1-by-3 and the size of the right side is 7-by-3." This error...

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Can anyone identify the error? and correct it.
Avoid an overkill of parentheses: Ip=(I0)+((p*I01)+(p*(P-1)I02)/(2))+((P(p-1)(p-2)*I03)/(6))+((p(p-1)(p-2)(p-3)*I04)/(24)) % ...

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Eliminate a for loop to increase speed
N = 2; L = 2; T = 1; a = [1 1i; -1i -1]; nplq = int8(de2bi((0:2^(N*L)-1),'left-msb')); % [0 0 0 0; 0 0 0 1; 0 0 1 0;...

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Question


List of all functions an their toolboxes
Is there a way to get a list of the names of all toolbox functions? If I publish a toolbox, I want to avoid conflicts with Matl...

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GUI handle empty after using some scripts
Running a pile of scripts impedes the debugging massively, as you can see. Any of the scripts can be responsible for overwriting...

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How to enable multi-core CPU processing during MATLAB code running?
It depends on the code. Many functions are multithreaded and use more cores for large inputs. This applies e.g. to sum(), filter...

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Why this gives error?
This is the failing function: function [x,fval,gfx,output] = main(varargin) [x,fval,gfx,output] = hPSO1(@main3, 4, options, ...

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Quaternions Computation Time too long
While the multiplication with the rotation matrix calls an optimzed BLAS library directly, rotatepoint is a function, which call...

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Create a binary image from a 2-dimensional binary [0 1] matrix
What have you tried? M = false(100, 100); M(26:50, 76:100) = true; % The black rectangle Instead of setting all pixels to bl...

presque 4 ans il y a | 1

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I wanna make a .mat file
In Matlab this is easy: data = magic(4); % Arbitrary test data save('file.mat', 'data')

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Monospaced Font seems different in different Matlab versions...
The font, which is used by the generiv name "monospaced", changes between Matlab versions. I do not know, why MathWorks decided ...

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Unable to perform assignment because the left and right sides have a different number of elements.
"But LFP1_t ed LFP2_t are both two vectors of 1000x1." - yes, of course, but the left side of the assignment correlation(t) is a...

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How to copy 30K images from folder to another according to the names in train and test text listes
With some guessing: source = 'D:\Dataset\NUSWIDE-Obj\imagesnus30k'; dest = 'D:\Dataset\NUSWIDE-Obj\Images30K'; tr = textr...

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Working with large numbers of vectors
Of course: If all vectors have the same size, concatenate them to a matrix. How are the 5000 vectors stored currently?

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