python-scipyHow do I use the trapz function in Python SciPy?

The trapz function in SciPy is a numerical integration routine used to approximate the definite integral of a given function. It uses the trapezoidal rule to approximate the area under a curve.

Example code

import numpy as np
from scipy.integrate import trapz

x = np.array([0, 1, 2, 3, 4])
y = np.array([1, 4, 3, 2, 5])

integral = trapz(y, x)
print(integral)

Output example

9.0

Code explanation

• import numpy as np: imports the NumPy library as np
• from scipy.integrate import trapz: imports the trapz function from the scipy.integrate library
• x = np.array([0, 1, 2, 3, 4]): creates an array of the x-values
• y = np.array([1, 4, 3, 2, 5]): creates an array of the y-values
• integral = trapz(y, x): calculates the integral using the trapz function
• print(integral): prints the calculated integral

Helpful links

• SciPy trapz documentation
• NumPy array documentation

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