How to plot the attached waterfall-type diagram and follow the peaks?

Hi All,

I would be grateful if anyone can help on plotting such a graph and follow the peaks. Any guidance on this matter would be appreciated. Thanks in advance.

Answer 1

[Abhipsa]

Hi @Arash A.,

The findpeaks function in MATLAB can be used to detect and highlight peaks in the curves.

The below code snippet demonstrates the usage of findpeaks

% I am using synthetic data for this demo, you can replace this with your
% actual data
x = linspace(500, 1000, 100);
y1 = 0.1*sin(0.02*x) + 0.05*rand(1,100);  % Example noisy sine wave
y2 = 0.12*sin(0.025*x) + 0.03*rand(1,100);
y3 = 0.08*sin(0.03*x) + 0.02*rand(1,100);

% store all curves in a matrix for plotting
Y = [y1; y2; y3];
% definining colors for curves
colors = ['r', 'b', 'g']; 

figure;
hold on;
for i = 1:size(Y,1)
    % Plot the curves
    plot(x, Y(i,:), colors(i), 'LineWidth', 1.5);

    % Find peaks
    [pks, locs] = findpeaks(Y(i,:), x, 'MinPeakProminence', 0.02);
    %pks is a vector with the local minima
    % locs is the indices at which the peak occurs

    % Plot peaks
    scatter(locs, pks, 80, colors(i), 'filled', 'MarkerEdgeColor', 'k');
end

xlabel('X-axis');
ylabel('Y-axis');
title('Peak Detection in Multiple Curves');
legend('Curve 1', 'Peaks 1', 'Curve 2', 'Peaks 2', 'Curve 3', 'Peaks 3');
grid on;
hold off;

●

You can refer to the below documentation to learn more about findpeaks :

https://www.mathworks.com/help/releases/R2024b/signal/ref/findpeaks.html

Hope this helps!