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wcsaxes.coords.set_axeslabel_position not working for y axis #11929
Description
Description
Following the example of the WCS Astropy page but only changing the placement of the axes label, the label was placed incorrectly.
Expected behavior
We expected the label "latitude" to be placed on the right axes only, while longitude was on the bottom.
Actual behavior
The label "latitude" was placed on both the right axis and the top axis.
Steps to Reproduce
from astropy.visualization.wcsaxes import WCSAxes
import matplotlib.pyplot as plt
from matplotlib.transforms import Affine2D
from astropy import units as u
# Set up an affine transformation
transform = Affine2D()
transform.scale(0.01)
transform.translate(40, -30)
transform.rotate(0) # radians
# Set up metadata dictionary
coord_meta = {}
coord_meta['name'] = 'lon', 'lat'
coord_meta['type'] = 'longitude', 'latitude'
coord_meta['wrap'] = 180, None
coord_meta['unit'] = u.deg, u.deg
coord_meta['format_unit'] = None, None
fig = plt.figure()
ax = WCSAxes(fig, [0.1, 0.1, 0.8, 0.8], aspect='equal',
transform=transform, coord_meta=coord_meta)
fig.add_axes(ax)
ax.set_xlim(-0.5, 499.5)
ax.set_ylim(-0.5, 399.5)
ax.grid()
ax.coords['lon'].set_axislabel('Longitude')
ax.coords['lat'].set_axislabel('Latitude')
ax.coords['lat'].set_axislabel_position('right')System Details
Python 3.8.10
Numpy 1.20.2
Astropy 4.2.1
Matplotlib 3.4.2
Activity
github-actions commentedon Jul 8, 2021
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astrofrog commentedon Jun 19, 2025
This is a subtle bug in the example you posted -
set_axislabel_positiondoes not take e.g.rightorleft- but one character per axis you want to show it on,rforright`,tfor top, etc. Since the word 'right' contains bothrandt``, it is placed on the right and top. The correct call is:Having said this, I'm surprised we don't error on invalid axis names. I'll investigate.