Remove one axis?

[charlesll]

Hi,

I am trying to remove the line marking the bottom X axis (raxis in mpl terminology) for one of my diagrams. I tried various things like but did not get anything to work.

Is that possible ? Is their anything like plt.axis('off') to set one of the axis off ?

Thanks in advance, Best, Charles.

[charlesll]

Also, I am trying to have the axis labels horizontal. I tried:

ax.set_rlabel('To Al$_2$O$_3$', rotation = 'horizontal')

but this does not work. Am I missing something or is that a bug?

[yuzie007]

Thank you @charlesll for using my code! Regarding your questions, does the below solves your problems?

import matplotlib.pyplot as plt
import mpltern

ax = plt.subplot(projection='ternary')

ax.set_tlabel('Top')
ax.set_llabel('Left')
ax.set_rlabel('Right')

ax.taxis.set_label_rotation_mode('horizontal')
ax.laxis.set_label_rotation_mode('horizontal')
ax.raxis.set_label_rotation_mode('horizontal')

ax.raxis.set_ticks([])  # remove only ticks
# ax.raxis.set_visible(False)  # remove both ticks and labels

plt.savefig('test.pdf')

Please also refer to: https://mpltern.readthedocs.io/en/latest/gallery/axis_and_tick/axis_label_rotation.html

If I remember correctly, rotation was disabled by default because it might not give a positioning we usually want. If you would like to control by yourself, please do ax.raxis.set_label_rotation_mode('manual'), and hopefully ax.set_rlabel('Right', rotation='horizontal') may work. (Actually, in the example above, this might give a better looking.)

[charlesll]

Thanks for your answer ! It clarifies most of the things I was wondering about :)

The only thing I would like to do now : is it possible to remove the horizontal line at the bottom of the diagram too ?

[charlesll]

I just noticed something : the Left label is not at the same vertical position as the Right label... Do you know how this could be solved ?

[charlesll]

I just noticed something : the Left label is not at the same vertical position as the Right label... Do you know how this could be solved ?

Hacked this by using annotate() instead of label().

[yuzie007]

is it possible to remove the horizontal line at the bottom of the diagram too ?

Yes; please use ax.spines as below. The tside indicates the edge opposite to the top corner (similarly we have lside and rside in ax.spines).

import matplotlib.pyplot as plt
import mpltern

ax = plt.subplot(projection='ternary')

ax.raxis.set_label_rotation_mode('manual')

ax.set_tlabel('Top', rotation=0)
ax.set_llabel('Left', rotation=0)
ax.set_rlabel('Right', rotation=0)

# ax.raxis.set_ticks([])  # remove only ticks

ax.raxis.set_tick_params(color=(0, 0, 0, 0), labelcolor=(0, 0, 0, 0))

ax.spines['tside'].set_visible(False)

ax.taxis.set_label_rotation_mode('horizontal')
ax.laxis.set_label_rotation_mode('horizontal')
ax.raxis.set_label_rotation_mode('horizontal')

plt.savefig('test4.png')

Thank you also for notifying the vertical alignment inconsistency for left and right labels, when no ticks. By default, I maybe implemented them to have positions not to overlap with tick labels. This however eventually also shows the dependence on if we have tick labels or not.

If a pragmatic solution is OK, one way might be to make tick labels of bottom to transparent, as also implemented above (ax.raxis.set_tick_params(color=(0, 0, 0, 0), labelcolor=(0, 0, 0, 0))). Otherwise, so far the best solution is to have new annotation text, as you already found.

[charlesll]

@yuzie007 thanks, works like a charm ! This does a nice diagram :)