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Concatenating matrices in a structure with same size into a 3D array.
x_mat.mat1=rand(100, 5); x_mat.mat2=rand(100, 5); x_mat.mat3=rand(100, 5); x_mat.mat4=rand(100, 5); c=struct2cell(x_mat); ...

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How can i solve initial value ordinary differential equation using matlab ??
I change integration variables to v=u*s and w=u^2*s; This should work (you need to sort out the discrepency of unit, speccially...

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struct function in Matlab
I recommand ro Store them in 4D array 16 x 16 x 16 x 1e4 No reason to use struct or cell or any other structure. It would make...

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Question

ismembertol second output specification
The command ismembertol it looks if elements of the first array belong to the second array with tolerance. The second output a...

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comparing two matrices of different dimensions
Fix several bugs of your for-loop code load('data1.mat'); load('data2.mat'); A=data1; B=data2; num_rows1=size(A(:,1),1); ...

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How can I assign a set of data from a 'meta.class' object propertys to a string array without using a loop statement?
cellarray... not array mc=?ClassA; K={mc.MethodList.Name} %or if prefer M=string(K)

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how to velocize it (vectorizing)
I don't know why a is matter beside that the first dimension is 10 a=magic(10); b=[4;5;9;2;3;4;2;7;4;9]; %width(a) element ...

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Where was the empty array created?
"1 So, is this 7*0 Base array stored in 'a,' ？in 'b'？ or does 'a' and 'b' each have a separate 7*0 Base array? Why?" This quest...

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Having each row compare its string with other rows within the problem and getting corresponding data relative to the string in other columns.
Not sure if you want this A=readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/1460327/Book1.xlsx'); he...

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Non-infinite recursion generating the message, "Out of memory. The likely cause is an infinite recursion within the program."
You recursion stop test is wrong, it does not take into account that basic matrices can be 1 x 2 or 2 x 1. I let you prove why ...

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Skewness calculator using one pass algorithm. Code speed up needed.
Implement skewness in C-mex #include "mex.h" #include "matrix.h" #include "math.h" /* compile command mex -O -R2018a s...

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How to split a irregular polgon into different parts having specific area for each part?
Same question answered here https://www.mathworks.com/matlabcentral/answers/586937-how-to-split-a-polygon

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RotationMean
Mean of the (3 x 3) rotation matrices

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Moving window Autocorrelation. One pass algorithm. Speed and Stability concerns.
Do not put if inside loop, start the loop from i=2 and do i=1 outside Do not compute inside the 2nd loop std(x(idx - window_si...

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Skewness calculator using one pass algorithm. Code speed up needed.
Simple factorize common quantities used in updating M1, M2, M3 function skewness = skewness_onepass_BLU2(x) N = length(...

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Remove zeros from a vector from a specific position
remove = all(~X,2); remove(1) = false; X(remove,:) = [];

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it's possible to velocize this loop?
@piero Your question/code is awfully asked: no comment, no description, cannot run as it is, debug code left over, etc.... load...

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row ranking among multiple matrices
Just very standard matlab programming % Generate test data N=10; M=3; A=rand(N,M)+1i*rand(N,M); MB = 1; MC = 2; B=randi(10...

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How to find the intersection values?
d1 = 0.4;d2 = 0.6;d = d1 + d2; n1 = sqrt(12);n2 = 1; lambda = linspace(400e-3,800e-3, 100000); D1 = (2*pi*n1*d1)./lambda;D2 =...

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Averaging rotation matrices and calculating the variability
It is not quite straightforward to compute the mean of rotation vector. The mean should be performed on SO(3) and any attemps ...

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the mass matrix and Jacobian matrix in ode15s
This script tests the formula with dummy test configuration by comparing with the Jacobian obtained from finite difference: run...

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Fastest way of submatrix multiplication
Take a look at pagemtimes Why don't you post the i-loop? In general why people don't post code that can run.

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A soumis

ricb
Random integer numbers with specified sum and bound constraints

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why does conv2 increase z height?
Properly blurring without boundary dropdown artefact: K = ones(15); blurredImage = conv2(data, K, 'same') ./ conv2(ones(size(d...

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How can I select two out of 6 points for every page without loops?
n = 4; nsolperpage = 2; X = randi(40, [6, 3, n]) mask = all(X >= 0 & X <= 30, 2); [~,p] = find(reshape(mask, [], n))...

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floor((I3(i,j-1)+I3(i-1,j))/2)
@RENJI "the expression evaluates to 192.5" The above is a FALSE statement since (I3(i,j-1)+I3(i-1,j))/2 cannot have fractional ...

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floor((I3(i,j-1)+I3(i-1,j))/2)
Set a breat point in your program, when it breaks type this and report the result I3(i,j-1) I3(i-1,j) (I3(i,j-1)+I3(i-1,j))/2...

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Nested for loops to compile all possible combinations of two vectors
vector1 = [1 2 3 ]; vector2 = [2 4 6 ]; [V1, V2] = meshgrid(vector1, vector2); A = [V1(:), V2(:), V1(:).*V2(:)]

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Solving self-consistent equations that involve matrices
Use fixpoint to find good startting point for lsqnonlin: this code converges and find a solution: % System Parameters E = 8.5;...

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How to using try and catch correctly to force loop go to next iteration?
Your try/catch works just fine, but your files are failed in the row. But as you are too lazy to check it is true or not it is j...

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