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square of a vector

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Berbia
Berbia 2012-10-31
I have to calculate a square of vector which should results a scalar value. i.e) A=(B-C)^2 B and C are vectors and I need A as a scalar. How can I implement this in matlab??

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Honglei Chen
Honglei Chen 2012-10-31
编辑：Honglei Chen 2012-10-31
My guess is you need an inner product, i.e. A = |B-C|^2, you can do it many different ways, one way is
B = ones(3,1);
C = ones(3,1);
A = (B-C)'*(B-C)
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Honglei Chen
Honglei Chen 2012-10-31
I'd say
temp = B-C;
temp'*temp
Matt J
Matt J 2012-10-31
编辑：Matt J 2012-10-31
You should think about whether the loop can be avoided altogether, since this sounds like a very vectorizable operation. If B and C are matrices and you want the dot product along columns, for example
temp=B-C;
result = sum(temp.^2,1);

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更多回答（1 个）

Matt J
Matt J 2012-10-31
A=norm(B-C)^2;

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