Answered
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...

3 years ago | 1

Answered
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...

3 years ago | 0

Answered
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 ...

3 years ago | 0

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Answered
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...

3 years ago | 0

Answered
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)) % ...

3 years ago | 0

Answered
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;...

3 years ago | 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...

3 years ago | 1 answer | 0

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Answered
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...

3 years ago | 0

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Answered
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...

3 years ago | 0

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

3 years ago | 0

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

3 years ago | 0

Answered
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...

3 years ago | 1

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

3 years ago | 0

Answered
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 ...

3 years ago | 1

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Answered
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...

3 years ago | 0

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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...

3 years ago | 0

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Answered
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?

3 years ago | 0

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Answered
Accessing each matrix in a cell array of size ~8GB and filter it
A loop is the efficient solution. Simply try it. If you have >= 16 GB of RAM, this array should be processed without problems. ...

3 years ago | 0

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Answered
the convolution function i wrote doesn't work for the big arrays
Pre-allocation is important, if you work with large arrays. Example: x = []; for k = 1:1e6 x(k) = k; end In each iterat...

3 years ago | 0

Answered
Matlab GUI elements disappear on newer version of Matlab
The uibuttongroup hides objects, which have been created before in modern Matlab versions. Set a position of the uibuttongroup'...

3 years ago | 0

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Answered
Identify lines that have a repetition (unique function)
data = [ 2.3300000e+02 3.5300000e+02 1.4912281e+00 2.3300000e+02 3.5200000e+02 1.4912281e+00 3.5300000e+0...

3 years ago | 0

Answered
How Do I Replace Numbers with Alphabets
The solution is trivial: Simply write it down using CHAR vectors (not strings, which are enclosed in double quotes): n = 'ABCDE...

3 years ago | 1

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Matlab energy consumption greater than charger?
This is not a problem of Matlab, but your powersupply is too weak. Is it the original one delivered with the laptop? If so, it m...

3 years ago | 0

Answered
addPath does not take a vector from genpath
According to the documentation https://www.mathworks.com/help/matlab/ref/matlab.project.project.addpath.html addPath() takes one...

3 years ago | 0

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Answered
How to rotate this 2d matrix with some angle ?
To define a rotation matrix, you need one angle in 2D (rotation around the Z axis) one angle and an axis of rotation in 3D on...

3 years ago | 1

Answered
mask a matrix based on values in two arrays
n = 1e4; u = floor(rand(10,1)*100); v = floor(rand(10,1)*100); tic % Original version: [x y] = meshgrid(linspace(0, 100, ...

3 years ago | 0

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Answered
Do not use the for loop to calculate the first number greater than 0 in each line
x = randn(10, 10) y = x.'; % Required for the last step y(y3==1) y1 = y > 0 y2 = cumsum(y1) % Now a row can contain mult...

3 years ago | 1

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Answered
fprintf with complex numbers and ordinary arrays
This does not work without a loop. fprintf(' iteration number root estimates\n'); for k = 1:n fprintf('%10.0...

3 years ago | 1

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Answered
What is the fastest way to export a large matrix of numbers from MATLAB to Excel (preferably as .xlsx) ?
Simply try it: M = magic(10^3); tic; writematrix(M, 'file1.xlsx'); toc tic; writecell(num2cell(M), 'file2.xlsx'); toc ...

3 years ago | 1

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Answered
All is correct but this code gives error?
I guess boldly, that the code fails here: [pop(i,:),fxi(i,1)]=fminsearch(fitnessfun,pop(i,:),options,varargin{:}); ... fxi=fe...

3 years ago | 0