How to repeat elements of a matrix

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charu shree
charu shree 2023-4-4
评论： Jon 2023-4-4
Hello all, I am having a matrix of size 8 by 16.
My query is how to obtain 8 by 500 matrix from 8 by 16 matrix.
Any help is highly appreciated.
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charu shree
charu shree 2023-4-4
Thank u sir for ur answer.
Basically I am having 16 column vectors each of size 8 by 1. I had arranged them to obtain another matrix of size 8 by 16. Now I want to make 8 by 500 matrix.
I understand that we can get 8 by 496 matrix. But is it possible to append any 4 colums of earlier 8 by 16 matrix to this new 8 by 496 matrix so that it forms 8 by 500 matrix ?
Steven Lord
Steven Lord 2023-4-4
Why not just pad your 8-by-16 array with 500-16 columns of NaN values?
x = reshape(1:8*16, [8 16]);
x(:, 17:500) = NaN;
Or fill in with random values:
x = reshape(1:8*16, [8 16]);
x(:, 17:500) = rand(8, 500-16);
What are the specific requirements for how you want the additional columns to be created?

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Jon
Jon 2023-4-4
编辑：Jon 2023-4-4
So is this what you want?
A = rand(8,16);
B = [repmat(A,1,31) A(:,1:4)];
In this case the last 4 columns of the 8 by 500 are the first 4 columns of the original 8 by 16 but you could use other columns if you wanted, just put in the indices you want

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