Fast Look-up table

Question

T 2015-2-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/180503-fast-look-up-table

回答： dpb 2015-2-26

Good morning, I have a long array signal with values x. Now for each of those values x I want to find the closest fit in another array pvalues and return the index. At the moment I am doing it like this:

for a=1:1:length(signal)
  tempp=pvalues-abs(signal(a));
  [c index1] = min(abs(tempp));
  %do stuff with index1
end

But this takes a lot of time (hours)! If I comment all lines and only iterate through the array signal, it is done in 3 seconds. So the problem is finding the index1 value.

Any ideas how to solve this quickly?

Thank you!