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Allow more than two twin axes #226
Description
Description
When calling ax.twinx() more than once, proplot throws the following error:
RuntimeError: No more than *two* twin axes are allowed.Steps to reproduce
import proplot as plot
fig, ax = plot.subplots()
axes = [ax, ax.twinx(), ax.twinx()]Equivalent steps in matplotlib
I'm trying to follow this example to make a floating additional y axis: https://stackoverflow.com/questions/7733693/matplotlib-overlay-plots-with-different-scales
import matplotlib.pyplot as plt
import numpy as np
# To make things reproducible...
np.random.seed(1977)
fig, ax = plt.subplots()
# Twin the x-axis twice to make independent y-axes.
axes = [ax, ax.twinx(), ax.twinx()]
# Make some space on the right side for the extra y-axis.
fig.subplots_adjust(right=0.75)
# Move the last y-axis spine over to the right by 20% of the width of the axes
axes[-1].spines['right'].set_position(('axes', 1.2))
# To make the border of the right-most axis visible, we need to turn the frame
# on. This hides the other plots, however, so we need to turn its fill off.
axes[-1].set_frame_on(True)
axes[-1].patch.set_visible(False)
# And finally we get to plot things...
colors = ('Green', 'Red', 'Blue')
for ax, color in zip(axes, colors):
data = np.random.random(1) * np.random.random(10)
ax.plot(data, marker='o', linestyle='none', color=color)
ax.set_ylabel('%s Thing' % color, color=color)
ax.tick_params(axis='y', colors=color)
axes[0].set_xlabel('X-axis')
plt.show()Proplot version
0.6.4
Activity
CatNofishing commentedon Sep 24, 2020
Thanks, this is a really powerful program. I love it. It is better than matplotlib.
lukelbd commentedon Jun 30, 2021
I think this is a duplicate of #51 -- eventually I want to support arbitrarily many "hanging" twins (or I guess triplets, quadruplets, ...) with the spines automatically spaced out from each other in an
EdgeStack.For now though I maketwin[xy]enforce rigid formatting and automatically apply axis sharing. So until #51 is implemented I think I'm going to keep the <=2 twins restriction -- otherwise would have to temporarily rewrite a lot of thetwin[xy]code.lukelbd commentedon Jun 30, 2021
...actually I changed my mind. Looked at it more closely and my
alt[xy]restrictions really weren't necessary (think they originally had to do with making it easier to write the tight layout algorithm, but that algorithm has since been simplified).It's now fixed -- you can add as many twin axes as you want, and I no longer force twin axes back into a rigid format at drawtime. Here is an adaptation of your example with proplot: