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Multiply 4D array with 2D array without a for loop

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Julian Büchel
Julian Büchel 2017-11-20
回答： KL 2017-11-20
I want to compute this:
for i=1:4
f = f+ norm(reshape(i2k(S(:,:,1,i) .* C,[1,2]) - b(:,:,1,i),[sz^2 1]) ,2)^2;
end
Without a for loop. Because we square the norm we can do that:
sum(abs(i2k(S(:,:,1,:) .* C,[1,2])-b(:,:,1,:)).^2);
But I get an error when I do this
S(:,:,1,:) .* C,[1,2]
Can somebody tell me how this is done correctly?

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回答（1 个）

KL
KL 2017-11-20
Try this,
bsxfun(@times,S(:,:,1,:),C)
but remember, the result you'll get as a 3D matrix.

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