Check if string matches many possibilities or check if doesn't match few possibilities.

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Christopher Wong 2020-11-2

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评论： Christopher Wong 2020-11-2

Let's say I have a set of validated strings: {'B2D2', 'CPS4', 'R2D2', 'RB2D2', 'SB2D2', 'T2D2'}. And I want to proceed based on whether the input string matches any of the following: {'B2D2', 'R2D2', 'RB2D2', 'SB2D2'}. Which would be a faster invocation of strcmp()?

if any(strcmp(params.Results.eletype, {'B2D2', 'R2D2', 'RB2D2', 'SB2D2'}))

Or, check if it DOES NOT match the supplementary possibilites:

if ~any(strcmp(params.Results.eletype, {'CPS4', 'T2D2'}))

I ask this from a high-performance standpoint. I'm trying to cut computation time wherever I reasonably can here.

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Answer 1

Ameer Hamza 2020-11-2

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编辑：Ameer Hamza 2020-11-2

I guess that 2nd should be faster because it involve less comparisons; however, Instead of speculations, it is better to just profile the code: https://www.mathworks.com/help/matlab/matlab_prog/profiling-for-improving-performance.html.