Find all peaks amplitude lies above 0 Using Scipy

Find all peaks amplitude lies above 0 Using Scipy

To find all peaks in a dataset where the amplitude lies above 0 using SciPy, you can use the find_peaks function from the scipy.signal module. This function is useful for identifying local maxima in a set of data. Here's a step-by-step guide on how to do it:

Step 1: Install SciPy (if not already installed)

If you haven't already installed SciPy, you can do so using pip:

pip install scipy

Step 2: Import Necessary Libraries

Import the required modules �C scipy.signal for peak finding and numpy for data manipulation.

import numpy as np from scipy.signal import find_peaks

Step 3: Define Your Data

Create or define the dataset in which you want to find the peaks. For example:

# Example data data = np.array([0.1, 1.2, 0.3, 2.4, 0.5, 0.6, 0.7, 2.8, 0.9])

Step 4: Find Peaks

Use find_peaks to find the indices of peaks. You can specify the condition that the peak heights must be greater than 0 using the height parameter.

peaks, _ = find_peaks(data, height=0)

This will return the indices of the data points where peaks are found with heights greater than 0.

Step 5: Get Peak Amplitudes

To get the amplitudes of these peaks, simply index into your dataset with the found peak indices.

peak_amplitudes = data[peaks]

Step 6: Print or Process the Peaks

Finally, you can print or process the peak indices and their amplitudes as needed.

print("Peak Indices:", peaks) print("Peak Amplitudes:", peak_amplitudes)

Complete Example

Here's the complete example put together:

import numpy as np from scipy.signal import find_peaks # Example data data = np.array([0.1, 1.2, 0.3, 2.4, 0.5, 0.6, 0.7, 2.8, 0.9]) # Find peaks peaks, _ = find_peaks(data, height=0) # Get peak amplitudes peak_amplitudes = data[peaks] # Print results print("Peak Indices:", peaks) print("Peak Amplitudes:", peak_amplitudes)

This script will identify the indices of all peaks in data where the amplitude is above 0 and then print out these indices along with the corresponding peak amplitudes.

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