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# Filling in the area underneath a curve in Matplotlib

schedule Aug 11, 2023
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PythonMatplotlib
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To fill the area underneath a curve in Matplotlib, use the `plt.fill_between(~)` method:

``` import numpy as npimport matplotlib.pyplot as pltx = np.linspace(0, 5, 1000)plt.plot(x, 2*x)# Fill from x=2 to x=4x_fill = np.linspace(2, 3, 1000)plt.fill_between(x_fill, 2*x_fill, alpha=0.5) # suppose f(x)=2xplt.show() ```

The three arguments that we've supplied to `fill_between(~)` are as follows:

• the upper bound of the y-values to shade in. Note that the lower bound is set to 0 by default.

• the transparency of the shaded area.

This gives us the following output:

By default, the lower bound is fixed at y=0. We can set a custom baseline by supplying one additional argument:

``` import numpy as npimport matplotlib.pyplot as pltx = np.linspace(0, 5, 1000)plt.plot(x, 2*x)# Fill from x=2 to x=3x_fill = np.linspace(2, 3, 1000)plt.fill_between(x_fill, 1, y2=2*x_fill, alpha=0.5) # suppose f(x)=2xplt.show() ```

Here, the second argument is our new baseline `y=1`, and the upper bound is set to the line.

The output is as follows:

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