Vectorizing evaluation of cell array of functions

Question

Tristan Potter 2019-9-18

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https://ww2.mathworks.cn/matlabcentral/answers/481041-vectorizing-evaluation-of-cell-array-of-functions

评论： Bruno Luong 2019-9-19

I have an S-by-1 cell array of function handles, each taking one argument---call it 'funcell'. I also have an S-by-1 vector of numeric values---call it 'inputs'. My goal is to obtain a numeric vector of size S-by-1---call it 'output', such that each element j of 'output' contains the corresponding function evaluated at the corresponding numeric value.

In a for loop, this would just be:

for j=1:S
    output(j)=funcell{j}(inputs(j))
end

The problem is that S is very large, so this is slow. Is there a way to vectorize this process for speed?

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Bruno Luong 2019-9-19

编辑：Bruno Luong 2019-9-19

"The problem is that S is very large, so this is slow. Is there a way to vectorize this process for speed?"

This is again a wrong preconceived slowness of FOR-LOOP. It is slow because you evaluate many function handles not because it is embeded in a FOR-LOOP.

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