return value optimization when overwriting
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Consider the following scenario.
function A=frobnicate(A)
A(1)=1;
end
X=zeros(2000,2000);
X=frobnicate(X);
By inspecting variables with `format debug`, one can see that Matlab (even in R2011b) makes an unnecessary copy of the whole 2000x2000 matrix when it calls the function in the last row. Is there a way to avoid the copy and let the function work on the data "in-place"?
I know about global variables and handle objects, but I read that both are quite inefficient and I doubt that they will actually make something like the above code faster.
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