Multi dimensional array scaling

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mark
mark 2014-1-19
评论： mark 2014-1-20
Given the matrix A (where A is X by Y by Z matrix. Scale the matrix A such that every element in the kth page is scaled by 5k for k = 1,2,3...Z.
I would have to produce a matrix B such that with element wise multiplication with matrix A it gives me the scaled version.
I have tried messing around with repmat and reshape functions but I can't seem to get it

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Azzi Abdelmalek
Azzi Abdelmalek 2014-1-19
编辑：Azzi Abdelmalek 2014-1-19
[n,m,p]=size(A)
out=5*reshape(repmat(1:p,n*m,1),size(A)).*A

更多回答（1 个）

Jan
Jan 2014-1-19
编辑：Jan 2014-1-19
What about starting will a simple loop:
s1 = 10;
s2 = 20;
s3 = 30;
A = rand(s1, s2, s3);
B = A;
for k = 1:s3
B(:, :, k) = B(:, :, k) * 5 * k;
end
Later on I'd prefer bsxfun:
B = bsxfun(@times, A, reshape(5:5:5*s3, 1, 1, s3))

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