How to sum particular values on the y axis

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Dan Lecoutre 2023-5-3

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评论： Dan Lecoutre 2023-5-3

I wish to sum the y axis values for the frequencies between 300Hz to 1000Hz, how do I do this?

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Torsten 2023-5-3

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移动：Torsten 2023-5-3

在 MATLAB Online 中打开

X = 0:1300;
Y = rand(size(X))
Y = 1×1301
    0.5067    0.8325    0.5811    0.4961    0.8288    0.9811    0.1431    0.7304    0.9984    0.4814    0.9243    0.8970    0.6703    0.2280    0.5562    0.2614    0.9846    0.0387    0.7453    0.3483    0.9077    0.3178    0.5999    0.7899    0.3604    0.9220    0.2648    0.7657    0.1160    0.4923
s = sum(Y(X>=300 & X<=1000))
s = 355.7618

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Torsten 2023-5-3

编辑：Torsten 2023-5-3

I wish to sum the value of each curve, I have used your code to do this. Does the code now look fine to sum over these ten curves?

Yes, if by "summing" you really mean "summing the Y-values". If you mean "integrate over the Frequency", you will have to multiply the result by "sampleFreq/burst_length". Or use "trapz".

Dan Lecoutre 2023-5-3