Avoiding load and/or for loop - speed up

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Ann Gerber
Ann Gerber 2020-10-19
评论： Mathieu NOE 2020-10-20
Hi everyone!
I have a directory containing mat-files. they all contain vectors A and B.
I would like to find the maximum value A.*B out of all the mat files. However loading all the .mat files and checking if the maximum value from all the last files is crossed is very timeconsuming:
for i = first:last
load(filename{i})
U = lowpass(A,wpass)*U_scale; % [V] Lowpass-filtered & scaled voltage data
I = lowpass(B,wpass)*I_scale; % [A] Lowpass-filtered & scaled current data
E = abs(U.*I)*t_S;
E_quant = quantile(E,0.9);
if E_max < max(E_quant)
E_max = max(E_quant);
end
end
How do I do this efficiently?
Thanks a lot!
Ann
  8 个评论
显示 6更早的评论
Ann Gerber
Ann Gerber 2020-10-19
I get the final data and have no influence on how they are generated unfortunately. Thanks anyway! When profiling the script I noticed that filtering is very timeconsuming...
Mathieu NOE
Mathieu NOE 2020-10-20
maybe you could decimate the data inside the loop before doing the low pass filtering
depends what is the original sampling rate and what bandwith must be kept for U and I ( for your computation E = abs(U.*I)*t_S;)
as decimation applies also low pass filtering , you have your lowpass effect plus you reduce the size of U and I.
=> help decimate

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