Adding every loop a matrix from the right side to a matrix

Question

Lars Urban 2022-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1715660-adding-every-loop-a-matrix-from-the-right-side-to-a-matrix

评论： KSSV 2022-5-10

I want to add after one loop a matrix to a matrix that was calculated one loop before. For example in the first loop the matrix would be 2x2 after second loop 2x4 and the next one 2x6 ...

I know that "manually" it would be i think like this

A = [1,2;3,4]
A = 2×2
     1     2
     3     4
B(:,1:2) = A 
B = 2×2
     1     2
     3     4
B(:,3:4) = A
B = 2×4
     1     2     1     2
     3     4     3     4

But how would this look like in a loop?

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Answer 1

KSSV 2022-5-10

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在 MATLAB Online 中打开

A = [1,2;3,4] ;
B = repmat(A,1,2)
B = 2×4
     1     2     1     2
     3     4     3     4

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Lars Urban 2022-5-10

Sorry the problem why it was creating a bigger matrix after a loop was because i had a mistake before repmat. Problem solved thank you for the help :)

KSSV 2022-5-10

Glad it worked for you.

Happy coding in MATLAB. :)

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Answer 2

Davide Masiello 2022-5-10

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https://ww2.mathworks.cn/matlabcentral/answers/1715660-adding-every-loop-a-matrix-from-the-right-side-to-a-matrix#answer_960905

编辑：Davide Masiello 2022-5-10

在 MATLAB Online 中打开

In the example below, a new 2x2 random matrix is created at each new iteration and appended to an existing matrix A.

clear,clc
A = [];
for i = 1:10
    B = rand(2,2);
    A = [A,B];
end
A
A = 2×20
    0.3994    0.6342    0.9210    0.0792    0.5605    0.1604    0.5920    0.6461    0.9130    0.8542    0.8578    0.3106    0.6250    0.0873    0.7464    0.4444    0.7945    0.1335    0.2230    0.5452
    0.6890    0.5618    0.7523    0.2968    0.8271    0.6431    0.2080    0.2957    0.9066    0.7982    0.6292    0.7462    0.0664    0.8576    0.5080    0.5076    0.3264    0.3242    0.8307    0.2477