Log scale on pcolor plot with only one tick #8557
Description
Bug report
Bug summary
The color scale only has one tickmark. This is never correct.
Code for reproduction
import numpy as np
import matplotlib
matplotlib.use('pdf')
import matplotlib.pyplot as plt
from matplotlib.colors import LogNorm
gcmap = 'plasma'
# random data
mi = 0.00058265
ma = 0.00108149
X, Y = np.meshgrid(range(512), np.linspace(0, 0.3 * 199, 200))
Z = mi+(ma-mi)*np.random.random(X.shape)
# log z axis
plt.pcolor(Z, cmap=gcmap,
norm=LogNorm(vmin=abs(Z.min()), vmax=abs(Z.max())))
plt.colorbar()
plt.xlim(0, 512)
plt.savefig("plot.pdf")Actual outcome
plot.pdf
Expected outcome
A colorbar with at least two tickmarks.
Matplotlib version
- Operating System: Mac OS X 10.12.4
- Matplotlib Version: 1.5.2
- Python Version: 3.5.2
installed via pip3, but reproducible on other systems