How to vectorize this simple problem?

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Mr M.
Mr M. 2017-5-10
编辑： Matt J 2017-5-10
Let R(n) be a vector, f(r) and g(r) are functions. Let A and B are complementer sets of indices. For example A = R(R>0); B = R(R<=0); I would like to act f on the subvector R(A), and g on the subvector R(B), but get back the whole vector in the original order, so for the output vector V(n) = f(R(n)) if n is element of A, and V(n) = g(R(n)) if n is element of B. f and g are computationally complex functions, so I dont want to evaluate f and g on the whole input vector R, just on necessary elements, but using a vectorized method, and somehow get back automatically the vector in the original order, not to vaste time of index shuffling. Is it possible? Which is the best method?

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Matt J
Matt J 2017-5-10
编辑：Matt J 2017-5-10
V=nan(size(R));
V(A)=f(R(A));
V(B)=g(R(B));

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