Plot points with the spectra

I have a set of points and their amplitudes. I want to plot a graph like this (fig bellow) in which amplitudes are plotted as the spectra of every points.

I plot the graph with command:

plot(f,pv,'k.') % f: frequency; pv: phase velocity

Could you help me to impose amplitude to this plot.

Thanks in advance.

Answer 1

[Anudeep Kumar]

Hey Ductho,

I believe the function ‘scatter’ can help you achieve your goal. The 'scatter' function comes with the option of specifying the circle colors, which can be a single color or an array , like in your case. You can also specify your circles to be filled.

Below is a short snippet on how to:

% Example data (replace with your own)
% f = ...;    % Frequency array
% pv = ...;   % Phase velocity array
% amp = ...;  % Amplitude array

scatter(f, pv, 20, amp, 'filled'); % 20 is the marker size, adjust as needed
colormap(jet);                     % Choose colormap (e.g., jet, parula, hot, etc.)
colorbar;                          % Show colorbar
xlabel('Frequency (MHz)');
ylabel('Phase Velocity (km/s)');
title('Amplitude Spectra');

Please refer to the ‘scatter’ documentation to further explore the possibilities and modify your code as per your need

https://www.mathworks.com/help/releases/R2025a/matlab/ref/scatter.html

Hope that helps!