I have come across a little inconsistency that was unexpected in the
matplotlib API. The following is perfectly valid:
import matplotlib.pyplot as plt
plt.plot([], [])
plt.show()
However, this is not valid:
import matplotlib.pyplot as plt
plt.scatter([], [])
plt.show()
The immediate issue that comes up in scatter is that it attempts to find
min/max of the input data for the purpose of autoscaling (this can probably
be done better by just using set_xmargin(0.05) and set_ymargin(0.05)). This
can easily be bypassed with an if statement. However, then we discover that
polygon collection do not like having empty offsets, which leads to a
failure in the affine transformation.
So, the question is, is this a bug or a feature? I personally believe that
empty data is a perfectly valid scenario and given that other matplotlib
functions handle it gracefully, we should make the collections object more
friendly to empty data.
Ben Root
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