How to multiply a subset of matrix by a column from another matrix?
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I have an array of 128x9252 and I would like to group them as
A1 = (:,1:257)
A2 = (:,258,514)
…
A36 = (:,8996:9252)
which will then be multiplied (.*) by y with the corresponding columns - y(:,1), y(:,2), y(:,3), etc.
This is what I want mathematically, A1 * y(:,1), A*y(:,2)), and so on.
How can I go about doing this?
This is what I have so far, but I keep getting an error saying 'Unable to perform assignment because the size of the left side is 128-by-1 and the size of the right side is 128-by-257.' and I'm not sure where the error is.
A = rand(128,9252);
B = zeros(128,257);
for m = 1:257
for n = 1:36
B(:,m) = A(:,257*(n-1)+1:257*n);
end
end
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Réponse acceptée
Matt J
le 23 Mar 2022
Modifié(e) : Matt J
le 23 Mar 2022
B = pagemtimes( reshape(A,128,257,[]) , reshape(y,257,1,[]) ) ;
B=squeeze(B);
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