MATLAB: How to ‘stretch’ a matrix using a loop

loopreshapestretch matrix

Hi,

I have a 252×252 distance matrix. Now I need to reshape this matrix into a 3528×3528 matrix: so rows and columns times 14. I want the first 14 rows and columns, so a matrix of 1:14,1:14, filled with the first cell in the old matrix.

So Dnew 1:14,1:14 = Dold 1,1 Dnew 15:28,1:14 = Dold 2,1 D new 1:14,15:28 = Dold 1,2

How do I program this using a loop? Since I need to repeat it for every 1:14,1:14 matrix within my 3528×3528 matrix.

Thanks

Best Answer

R2015a or later: use repelem:

repelem(M,14,14)

Earlier versions: use kron:

kron(M,ones(14))

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Here is a way:

T = {[1:5:21]',[2:5:22]',[3:5:23]',[4:5:24]',[5:5:20]'}
m=3
n=8
[M, tf] = padcat(T{:})
M = M.' 
out = reshape(M(tf.'),n,m).' % swap m and n, and then transpose

PADCAT concatenates unequal sized vectors by padding shorter ones with NaNs. This function can be downloaded from the File Exchange: https://uk.mathworks.com/matlabcentral/fileexchange/22909-padcat-varargin-

Best Answer

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