How to Smooth a Line Plot in Python using PyPlot and Scipy?

Smoothing a Line Plot with PyPlot

PyPlot's default line plot method connects data points with straight lines. This approach can result in jagged lines, especially when dealing with large datasets. Fortunately, there is an easy way to smooth out these lines using scipy.interpolate.spline.

<code class="python"># Import necessary libraries
import matplotlib.pyplot as plt
import numpy as np
from scipy.interpolate import spline

# Define data arrays
T = np.array([6, 7, 8, 9, 10, 11, 12])
power = np.array([1.53E+03, 5.92E+02, 2.04E+02, 7.24E+01, 2.72E+01, 1.10E+01, 4.70E+00])

# Generate a smoothed spline
xnew = np.linspace(T.min(), T.max(), 300)
power_smooth = spline(T, power, xnew)

# Plot the smoothed line
plt.plot(xnew, power_smooth)
plt.show()</code>

Before smoothing:

After smoothing:

Alternatively, you can use BSpline from scipy.interpolate.make_interp_spline for a more modern approach:

<code class="python"># Import make_interp_spline and BSpline
from scipy.interpolate import make_interp_spline, BSpline

# Generate a smoothed spline using BSpline
spl = make_interp_spline(T, power, k=3)
power_smooth = spl(xnew)

# Plot the smoothed line
plt.plot(xnew, power_smooth)
plt.show()</code>

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