Closed
Description
Bug report
Bug summary
When passing width_ratios = [1, 1, 1] instead of not passing it at all (which should be synonymous), constrained_layout sometimes gives incorrect results.
Code for reproduction
import matplotlib as mpl
from matplotlib import pyplot as plt, gridspec, testing
mpl.rcdefaults()
mpl.style.use(["classic", "_classic_test_patch"])
mpl.testing.set_font_settings_for_testing()
def example_plot(ax, fontsize=12):
ax.plot([1, 2])
ax.locator_params(nbins=3)
ax.set_xlabel('x-label', fontsize=fontsize)
ax.set_ylabel('y-label', fontsize=fontsize)
ax.set_title('Title', fontsize=fontsize)
fig = plt.figure(constrained_layout=True)
gs = gridspec.GridSpec(3, 3, figure=fig)
ax1 = fig.add_subplot(gs[0, 0])
ax2 = fig.add_subplot(gs[0, 1:])
ax3 = fig.add_subplot(gs[1:, 0:2
683A
])
ax4 = fig.add_subplot(gs[1:, -1])
for ax in fig.axes:
example_plot(ax)
fig.savefig("/tmp/cl1.png")
fig = plt.figure(constrained_layout=True)
gs = gridspec.GridSpec(3, 3, figure=fig,
width_ratios=[1, 1, 1], height_ratios=[1, 1, 1])
ax1 = fig.add_subplot(gs[0, 0])
ax2 = fig.add_subplot(gs[0, 1:])
ax3 = fig.add_subplot(gs[1:, 0:2])
ax4 = fig.add_subplot(gs[1:, -1])
for ax in fig.axes:
example_plot(ax)
fig.savefig("/tmp/cl2.png")
plt.show()Actual outcome
cl1.png
cl2.png
Clearly in cl2.png the widths are not in the ratios 1:1:1 but (approximately) 1:2:1.
This is likely a floating point error; it is extremely sensitive to conditions, in particular the call to set_font_settings_for_reproducibility (which just sets some font-related rcs) is necessary to observe this.
Expected outcome
twice the same image
Matplotlib version
- Operating system: archlinux
- Matplotlib version: master
- Matplotlib backend (
print(matplotlib.get_backend())): agg - Python version: 38
- Jupyter version (if applicable): no
- Other libraries: