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Topic: Efficiently computing large numbers of vector norms
Replies: 16   Last Post: Nov 15, 2012 8:32 AM

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Bruno Luong

Posts: 8,845
Registered: 7/26/08
Re: Efficiently computing large numbers of vector norms
Posted: Nov 8, 2012 7:55 AM
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"Harry Commin" wrote in message <k7elhj$as1$1@newscl01ah.mathworks.com>...

> for j = 1:Q2
> Z(:,j) = sum(abs(kron(A1,A2(:,j))'*X2).^2,2);
> end
>


This intermediate result
kron(A1,A2(:,j))'*X2

can be better computed using kronecker's property. See when Matt pickup this thread.

Bruno



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