How can I change the x axis so there is no white space?

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There is an automatic margin set at the edges, which ensures the data to be nicely fitting within the axis spines. In this case such a margin is probably desired on the y axis. By default it is set to 0.05 in units of axis span.

To set the margin to 0 on the x axis, use

plt.margins(x=0)

or

ax.margins(x=0)

depending on the context. Also see the documentation.

In case you want to get rid of the margin in the whole script, you can use

plt.rcParams['axes.xmargin'] = 0

at the beginning of your script (same for y of course). If you want to get rid of the margin entirely and forever, you might want to change the according line in the matplotlib rc file:

axes.xmargin : 0
axes.ymargin : 0

Example

import seaborn as sns
import matplotlib.pyplot as plt

tips = sns.load_dataset('tips')

fig, (ax1, ax2) = plt.subplots(1, 2, figsize=(10, 4))
tips.plot(ax=ax1, title="Default Margin")
tips.plot(ax=ax2, title="Margins: x=0")
ax2.margins(x=0)

enter image description here

Alternatively, use plt.xlim(..) or ax.set_xlim(..) to manually set the limits of the axes such that there is no white space left.

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