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BUG: don't plot colorbar if c is column containing colors #34344

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Merged
merged 5 commits into from
Jun 14, 2020
Merged

BUG: don't plot colorbar if c is column containing colors #34344

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c05b255
don't plot colorbar if c is column containing colors
MarcoGorelli May 23, 2020
6562795
check for numeric rather than is_color
MarcoGorelli May 25, 2020
e70c650
fit on one line
MarcoGorelli May 25, 2020
0f2c00a
rename
MarcoGorelli May 25, 2020
4a60600
take care of case when use passes cmap but c isn't numeric column
MarcoGorelli May 30, 2020
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2 changes: 1 addition & 1 deletion doc/source/whatsnew/v1.1.0.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -803,7 +803,7 @@ Plotting
- Bug in :meth:`DataFrame.boxplot` and :meth:`DataFrame.plot.boxplot` lost color attributes of ``medianprops``, ``whiskerprops``, ``capprops`` and ``medianprops`` (:issue:`30346`)
- Bug in :meth:`DataFrame.hist` where the order of ``column`` argument was ignored (:issue:`29235`)
- Bug in :meth:`DataFrame.plot.scatter` that when adding multiple plots with different ``cmap``, colorbars alway use the first ``cmap`` (:issue:`33389`)

- Bug in :meth:`DataFrame.plot.scatter` was adding a colorbar to the plot even if the argument `c` was assigned to a column containing color names (:issue:`34316`)

Groupby/resample/rolling
^^^^^^^^^^^^^^^^^^^^^^^^
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8 changes: 5 additions & 3 deletions pandas/plotting/_matplotlib/core.py
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Expand Up @@ -13,6 +13,7 @@
is_iterator,
is_list_like,
is_number,
is_numeric_dtype,
)
from pandas.core.dtypes.generic import (
ABCDataFrame,
Expand Down Expand Up @@ -951,9 +952,6 @@ def _make_plot(self):

c_is_column = is_hashable(c) and c in self.data.columns

# plot a colorbar only if a colormap is provided or necessary
cb = self.kwds.pop("colorbar", self.colormap or c_is_column)

# pandas uses colormap, matplotlib uses cmap.
cmap = self.colormap or "Greys"
cmap = self.plt.cm.get_cmap(cmap)
Expand All @@ -969,6 +967,10 @@ def _make_plot(self):
else:
c_values = c

# don't plot a colorbar if `c` is a column containing color names
c_is_numeric_col = c_is_column and is_numeric_dtype(c_values)
cb = self.kwds.pop("colorbar", self.colormap or c_is_numeric_col)
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emm, i meant something like this:

# plot colorbar if 1. colormap is assigned, 2.`c` is a column containing only numeric values
plot_colorbar = self.colormap or c_is_column
cb = self.kwds.pop("colorbar", is_numeric_dtype(c_values) and plot_colorbar)

because even when colormap is defined, if not all values of c column are numeric, we still dont want to plot colorbar, because it doesnt make sense so far. What do you think?

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Yes, you're right, thanks! The way I'd originally written it there would still be a colorbar if the user passed something to cmap


if self.legend and hasattr(self, "label"):
label = self.label
else:
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10 changes: 10 additions & 0 deletions pandas/tests/plotting/test_frame.py
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Expand Up @@ -1306,6 +1306,16 @@ def test_plot_scatter_with_c(self):
float_array = np.array([0.0, 1.0])
df.plot.scatter(x="A", y="B", c=float_array, cmap="spring")

def test_scatter_with_c_column_name_with_colors(self):
# https://github.com/pandas-dev/pandas/issues/34316
df = pd.DataFrame(
[[5.1, 3.5], [4.9, 3.0], [7.0, 3.2], [6.4, 3.2], [5.9, 3.0]],
columns=["length", "width"],
)
df["species"] = ["r", "r", "g", "g", "b"]
ax = df.plot.scatter(x=0, y=1, c="species",)
assert ax.collections[0].colorbar is None

def test_plot_scatter_with_s(self):
# this refers to GH 32904
df = DataFrame(np.random.random((10, 3)) * 100, columns=["a", "b", "c"],)
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