8000 MNT: Warn on using pixel marker for scatter() · matplotlib/matplotlib@bc60ed4 · GitHub
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MNT: Warn on using pixel marker for scatter()
Improves on #11460.
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lib/matplotlib/axes/_axes.py

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@@ -4933,6 +4933,12 @@ def scatter(self, x, y, s=None, c=None, marker=None, cmap=None, norm=None,
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# load default marker from rcParams
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if marker is None:
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marker = mpl.rcParams['scatter.marker']
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if marker == ",":
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_api.warn_external(
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"The pixel maker ',' is not supported on scatter(). Fallback "
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"to a finite-sized square, which is not necessarily 1 pixel in "
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"size. Use the square marker 's' instead to suppress this warning."
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)
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if isinstance(marker, mmarkers.MarkerStyle):
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marker_obj = marker

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