Remove empty space from matplotlib bar plot

Question

I plot two bar plots to the same ax, where the x axis contains values from 0 downwards. However, I have significant gaps in my data (like from 0 to -15), and would like to remove the empty space, so that the axis goes from 0 to -15 with no space in between - show on this image:

Ideally I would like to do this for all gaps. I have tried both plt.axis('tight') and fig.tight_layout(), but neither of them have worked.

Edit: sample code for a small example

keys = [0, -15, -16, -17]
values = [3, 5, 2, 1]

fig, ax = plt.subplots(ncols=1)
fig.tight_layout()

ax.bar(keys, values, 0.8, color='g', align='center')

ax.set_xticks(keys)
plt.setp(ax.xaxis.get_majorticklabels(), rotation=90 )

Trenton McKinney · Accepted Answer · 2021-11-08 23:06:02Z

1

The easiest way to resolve the issue is plot values against an x that is a range corresponding to the len of keys, and then change the xticklabels.

import matplotlib.pyplot as plt

keys = [0, -15, -16, -17]
values = [3, 5, 2, 1]

fig, ax = plt.subplots()

# create the xticks locations
x = range(len(keys))

ax.bar(x, values, 0.8, color='g', align='center')

# set the ticks and labels
ax.set_xticks(x)
_ = ax.set_xticklabels(keys)

Sorting

keys = [0, -15, -16, -17]
values = [3, 5, 2, 1]

# zip, sort and unpack
keys, values = zip(*sorted(zip(keys, values)))

fig, ax = plt.subplots()

# create the xticks locations
x = range(len(keys))

ax.bar(x, values, 0.8, color='g', align='center')

# set the ticks and labels
ax.set_xticks(x)
_ = ax.set_xticklabels(keys)

edited Nov 8, 2021 at 23:06

answered Nov 8, 2021 at 22:53

Trenton McKinney

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