Description
Bug report
Bug summary
spy always draws with the origin in the upper left corner if marker is not None, even if origin='lower' is provided as a keyword argument.
Code for reproduction
points = np.zeros([10, 5])
points[5:] = 1
fig, ax = plt.subplots()
ax.spy(points, marker='.', origin='lower')Actual outcome
After this point, the origin appears to be fixed in the upper left corner. Any subsequent commands (imshow, spy) seem to ignore origin='lower'.
Expected outcome
Note that ax.spy(points, origin='lower') (omitting the marker argument) works properly:
Though it's worth pointing out that the x-axis ticks and labels always end up in upper spine, not the lower one, regardless of origin='upper' or origin='lower'. The behavior of imshow is a bit different. If origin='lower', the ticks and labels are moved to the bottom.
The documentation for spy notes that:
If *Z* is a `scipy.sparse.spmatrix` or *marker* or *markersize* are
*None*, a `~matplotlib.lines.Line2D` object will be returned with
the value of marker determining the marker type, and any
remaining kwargs passed to `~.Axes.plot`.
So that seems to explain why including marker changes the function's behavior.
Matplotlib version
- Operating system: Centos 7
- Matplotlib version: 3.1.2
- Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: 3.6.8
- Jupyter version (if applicable):
- Other libraries:
Installed using anaconda.