How to find the peaks (both x and y location)

John Michell answered . 2025-03-27 21:40:53

[pks, locs] = findpeaks(Temperature, Scope);

Explanation

• Temperature: Your y values (the data you want to find peaks for).
• Scope: Your x values (the corresponding x-axis data for the peaks).

The output will be:

• pks: The peak values in the Temperature array.
• locs: The corresponding x values from the Scope array where the peaks occur.

Example

Scope = 1:0.1:10; % Example x-axis values
Temperature = sin(Scope) + 0.1*rand(size(Scope)); % Example y-axis values with noise

[pks, locs] = findpeaks(Temperature, Scope);

% Plot results
plot(Scope, Temperature);
hold on;
plot(locs, pks, 'ro'); % Mark peaks
xlabel('Scope');
ylabel('Temperature');
title('Peaks in Temperature Data');

Key Points

1. Ensure that Scope and Temperature have the same length.
2. Use findpeaks with both y and x inputs to get the correct x locations for the peaks.
3. If you need additional options (e.g., threshold, minimum peak distance), you can specify them as name-value pairs:

[pks, locs] = findpeaks(Temperature, Scope, 'MinPeakHeight', 0.5, 'MinPeakDistance', 10);

Let me know if you need further clarification!

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