Lookup tables in Matlab

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Uwe Ehret 2015-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/258875-lookup-tables-in-matlab

评论： Uwe Ehret 2015-12-7

Dear All,

I want to use lookup tables in Matlab to replace computation of complicated functional relations. The goal is to speed up computations. In the SIMULINK environment, I found a set of tools that perfectly matches my needs: the blocks '1-D lookup table', '2-D lookup table', 'Prelookup' etc.

My questions are: - Is a comparable set of tools or functions available in MATLAB? So far I have found approaches using interp1. Is this the fastest approach or are there better ways? And: So far I have not found a way to pass to interp1 the index of the previous search as search entry point (which speeds up things when changes between calls are small). - Can I use the mentioned SIMULINK blocks in Matlab? And if yes: how, and will it makes sense if computational speed is an issue?

Uwe

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Answer 1

Walter Roberson 2015-12-4

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https://ww2.mathworks.cn/matlabcentral/answers/258875-lookup-tables-in-matlab#answer_202236

http://www.mathworks.com/matlabcentral/fileexchange/43325-quicker-1d-linear-interpolation--interp1qr

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Uwe Ehret 2015-12-7

Thanks for pointing me to interp1qr! I tested interp1q (build-in Matlab function), interp1qr, and nakeinterp1 (a .mex function provided in http://www.mathworks.com/matlabcentral/newsreader/view_thread/258413). - interpqr is ~ 3x faster than interp1q - nakeinterp1 is ~ 10x faster than interp1q --> If there are no other alternatives, I will use the .mex function for now. Uwe

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