X-axis label doesn't show on Pandas DataFrame plot with colorbar

Question

I want to make a pandas.DataFrame.plot with colorbar. For reproducibility, here I use the code in this post on stack overflow.

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
import itertools as it

# [ (0,0), (0,1), ..., (9,9) ]
xy_positions = list( it.product( range(10), range(10) ) )

df = pd.DataFrame( xy_positions, columns=['x','y'] )

# draw 100 floats
df['score'] = np.random.random( 100 )

ax = df.plot( kind='scatter',
              x='x',
              y='y',
              c='score',
              s=500,
              xlabel='x')
ax.set_xlim( [-0.5,9.5] )
ax.set_ylim( [-0.5,9.5] )
plt.tight_layout()

However, in my environment the figure doesn't show x-axis somehow. So I try to add ax.set_xlabel("x label") in the code, but the output doesn't change.

Here are the package versions of my Python environment.

• Python 3.8.12
• pandas 1.4.0
• matplotlib 3.5.1

Is there any suggestion of this issue? Thanks!

Additional information: I use macOS Big Sur version 11.6 on MacBook Pro M1.

Answer 1

Can you try:

fig, ax = plt.subplots()
cm = plt.cm.get_cmap('Greys')

sc = ax.scatter(df['x'], df['y'], s=500, c=df['score'],
                vmin=df['score'].min(), vmax=df['score'].max(), cmap=cm)
cb = fig.colorbar(sc)
t = cb.set_label('score', rotation=-90)

ax.set_xlim( [-0.5,9.5] )
ax.set_ylim( [-0.5,9.5] )
ax.set_xlabel('x')
ax.set_ylabel('y')

plt.tight_layout()
plt.show()

Output: