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Description
Bug summary
The return value of plot a Line2D lets you set_data as [[], []] this is nice because you can do both of
line = plt.plot([],[])[0]
line.set_data([[],[]])allowing you to make a line disappear by setting it's data to empty. This comes up surprisingly often for me when using mpl-interactions to explore datasets
However, plt.scatter does not have the same symmetry of behavior. You can do
scatter = plt.scatter([[], [])but you cannot then do
scatter.set_offsets([[],[]])Code for reproduction
# works
line = plt.plot([],[])[0]
# works
line.set_data([[],[]])
# works
scatter = plt.scatter([],[])
# fails
scatter.set_offsets([[],[]])Actual outcome
---------------------------------------------------------------------------
IndexError Traceback (most recent call last)
Input In [76], in <module>
1 scatter = plt.scatter([],[])
----> 2 scatter.set_offsets([[],[]])
File ~/mambaforge/envs/mpl-inter/lib/python3.9/site-packages/matplotlib/collections.py:566, in Collection.set_offsets(self, offsets)
563 if offsets.shape == (2,): # Broadcast (2,) -> (1, 2) but nothing else.
564 offsets = offsets[None, :]
565 self._offsets = np.column_stack(
--> 566 (np.asarray(self.convert_xunits(offsets[:, 0]), 'float'),
567 np.asarray(self.convert_yunits(offsets[:, 1]), 'float')))
568 self.stale = True
IndexError: index 0 is out of bounds for axis 1 with size 0
Expected outcome
No error and the scatter should not be drawn.
Additional information
No response
Operating system
No response
Matplotlib Version
3.5.1
Matplotlib Backend
any
Python version
3.9.9
Jupyter version
No response
Installation
pip
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