Sum of both negative - positive part of a Peak
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Dear ALL,
I have a peak that I woud like to take the integral of it, however, this peak has a positive (> 0 baseline) and negative part (< 0 beaseline).
So, is it any function in MATLAB that automatically sums both parts?
Please see attached the example...
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採用された回答
Star Strider
2019 年 11 月 25 日
Try this:
x = linspace(6.622, 9.644);
y = exp(-(x-mean(x)).^2/0.5) - 0.1;
Lv = y>=0;
PosPart = trapz(x(Lv), y(Lv))
NegPart = trapz(x(~Lv), y(~Lv))
SumParts = PosPart - NegPart
figure
plot(x, y)
Experiment to get different results.
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Star Strider
2019 年 11 月 25 日
編集済み: Star Strider
2019 年 11 月 25 日
My pleasure!
EDIT — (25 Nov 2019 at 22:10)
Depending on what you want to do, this may be more accurate:
Lv = y>=0;
PosPart = trapz(x(Lv), y(Lv))
LT0 = trapz(x(~Lv), ones(size(x(~Lv)))*min(y))
NegPart = LT0 - trapz(x(~Lv), y(~Lv))
SumParts = PosPart - NegPart
その他の回答 (1 件)
Image Analyst
2019 年 11 月 25 日
What if you sum the absolute value of the signal?
area = sum(abs(signal));
That will be the difference between the signal and the y axis.
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