# How can i fill a pre-allocated matrix 2D?

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Harry Smith on 25 Jul 2021
Commented: Image Analyst on 25 Jul 2021
Hello everyone!
i hope you can help me.
My code is:
[A, B]=size(storage);
nan_matrix=NaN(500,1000);
for ii=1:A
for k=1:B
[x,y]=corr(....)
end
end
%put x-values in the nan_matrix and save this matrix
How?
dpb on 25 Jul 2021
[rho, p_val]=corr(x,y, 'type', 'spearman');
the x_dimension is: 300x4
So, what is y?
"If you input matrices X and Y, rho is a k1-by-k2 matrix, where k1 and k2 are the number of columns in X and Y, respectively. The entry rho(a,b) is the pairwise linear correlation coefficient between column a in X and column b in Y."
I still don't follow why you think you need other storage...

Image Analyst on 25 Jul 2021
I'd use xcorr2().
##### 2 CommentsShowHide 1 older comment
Image Analyst on 25 Jul 2021
It's a sliding window that gives you the correlation of one set of data with another. What were you thinking of doing when you had corr() inside the double nested for loop?