Problem with Frequency distribution plot
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I have a scatter plot in (x, z). I need to plot a frequency distribution of z-values as a function of x. Please suggest.
4 个评论
Torsten
2023-4-12
A frequency distribution of z-values is a plot where the x-axis are the z-values and the y-axis shows the frequency of the z-values.
But what is a frequency distribution of z-values as a function of x ?
Torsten
2023-4-13
So the z-value doesn't matter ? Then simply use histogram(x).
Image Analyst
2023-4-13
This is a poorly worded question. Perhaps frequency distribution means histogram. I was thinking it was like a signal and he wanted the frequency spectrum of the signal. But it looks like @AkB is ignoring our comments, so I'm not going to do anything more until we hear back from @AkB with a clearer explanation of what the context/situation is.
I think he/she is unsure about it himself/herself.
回答（1 个）
Image Analyst
2023-4-12
If x is not uniformly spaced then use interp1 or spline to get x and z uniformly spaced. Then call fft(z).
ft = fft(z);
plot(abs(ft), 'b-');
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