increase processing speed of code entropy histcount

조회 수: 2(최근 30일)
ALDO
ALDO 2021년 7월 27일
댓글: ALDO 2021년 8월 3일
Hi
I have the following code and an trying to calculate entropy of a signal over a moving window. my signal is A=1x1080000. sampling frequency is 125 samples/sec. Please find my code below.
I know my code is correct because it gives me the correct answer when i choose a large window and large shift value. but it take very long to process when the window and shift size are smaller. Does any One have any suggestions on how to optimize it so that it would run faster. Thank you in advance for your help. Please ley me know if anything is unclear.
Best regards,
windowsize=2*125; % 2second window taking into account sampling frequency
shiftsize=floor(1*125);
initial = 1:shiftsize:length(A);
final = windowsize:shiftsize:length(A);
for j=1:length(final)
B=A(initial(j):final(j));
pdf=histcounts(B,'Normalization', 'pdf');
app.entropyA(final) = -sum(pdf.*log2(pdf));
end

답변(1개)

Swetha Polemoni
Swetha Polemoni 2021년 7월 30일
Hi
In the following documentation general techniques to improve the performance has been mentioned
Hope you find this helpful

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