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Speed up for loop

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Emiliano Ascenzi
Emiliano Ascenzi 2020-4-23
评论： Med Aymane Ahajjam 2021-7-28
I need to speed up this code, T is a table with 5 columns and approximately 1 million rows. The code is doing what I need but it is pretty slow, it takes 1 hour to do the calculation. Someone can help?
Thanks in advance
rmsA = zeros(height(T),1);
for i=1:height(T)
tf = isbetween(T.VarName1,T.VarName(i)-minutes(2),T.VarName(i)+minutes(2));
xA = T.VarName2(tf);
rmsA(i) = rms((xA-993)/102.04);
end
  2 个评论
BALAJI KARTHEEK
BALAJI KARTHEEK 2020-4-23
Use parallel computing and parfor loops are available in matlab exactly to solve these type of problems
darova
darova 2020-4-23
Can you attach sample data for experiments?

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回答（1 个）

Sulaymon Eshkabilov
To process date data format is slow. Thus, you can convert all into a serial date number using datenum() that shall speed up the simulation process.
good luck
  2 个评论
Emiliano Ascenzi
Emiliano Ascenzi 2020-4-24
How can I apply isbetween to datenum output? I don't know how much 2 minutes are worth in that form
Med Aymane Ahajjam
Med Aymane Ahajjam 2021-7-28
treat them like you would with normal numbers : .. < .. < ..

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