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Signal smoothing for logarithmic timescale

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Divij Gupta
Divij Gupta 2021년 7월 9일
댓글: Mathieu NOE 2021년 7월 9일
I want to perform signal smoothing for the graph shown above. However, using the method shown in MATLAB documentation is not working since the timescale for my graph is logarithmic (logspace(1,5,1000)), not linear. How can I smooth this using a filter?

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Mathieu NOE
Mathieu NOE 2021년 7월 9일
hello
you can smooth data even in log spacing
a demo code is provided below. I kept the amount of samples low , so the smoothed curve is easy to see that the constant log spacing is still there.
clc
clearvars
% dummy data : x is Logarithmically spaced vector
samples = 100;
xlog = logspace(1,5,samples);
ylog = (1-exp(-xlog*1e-4)).*randn(1,samples);
% smoothdata
N = 25;
ylogs = smoothdata(ylog,"gaussian",N);
semilogx(xlog,ylog,xlog,ylogs,'-*');
legend ('raw data','smoothed');
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Mathieu NOE
Mathieu NOE 2021년 7월 9일
My pleasure

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