Fast function application

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Mateusz
Mateusz 2011-9-29
Hi,
Let a be n-dimensional vector, B n-by-n dimensional matrix, f(a, b) - binary function that operates on two vectors, and returns scalar as a result. Is there fast way (no-loops) to implement application of this function to vector a and every column of matrix B? More precisely forall_j r(j) = f(a, B(:, j))?
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Mateusz
Mateusz 2011-9-29
I think I cannot repmat vector 'a' since f has to work explicitly on vectors.

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Walter Roberson
Walter Roberson 2011-9-29
These days, "no loops" is not necessary any faster.
You can use
arrayfun(@(K) f(a,B(:,K)), 1:size(B,2))
but that will probably not be any faster than a loop.

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