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Merged
merged 2 commits into from
Nov 18, 2011
Merged

resolve issue 368 #385

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7b2827b
DataFrame.boxplot() now returns matplotlib.axes.AxesSubplot
lodagro Nov 18, 2011
cdc1652
Handle boxplot arguments column and grid properly.
lodagro Nov 18, 2011
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1 change: 1 addition & 0 deletions pandas/core/frame.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3054,6 +3054,7 @@ def boxplot(self, column=None, by=None, ax=None, fontsize=None,
ax = plots.boxplot(self, column=column, by=by, ax=ax, fontsize=fontsize,
grid=grid, rot=rot)
plt.draw_if_interactive()
return ax

def plot(self, subplots=False, sharex=True, sharey=False, use_index=True,
figsize=None, grid=True, legend=True, rot=30, ax=None,
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30 changes: 23 additions & 7 deletions pandas/tools/plotting.py
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Expand Up @@ -21,7 +21,7 @@ def boxplot(data, column=None, by=None, ax=None, fontsize=None,
Parameters
----------
data : DataFrame
column : column names or list of names, or vector
column : column name or list of names, or vector
Can be any valid input to groupby
by : string or sequence
Column in the DataFrame to group by
Expand All @@ -37,22 +37,34 @@ def plot_group(grouped, ax):
ax.boxplot(values)
ax.set_xticklabels(keys, rotation=rot, fontsize=fontsize)

if column == None:
columns = None
else:
if isinstance(column, (list, tuple)):
columns = column
else:
columns = [column]

if by is not None:
if not isinstance(by, (list, tuple)):
by = [by]

columns = None if column is None else [column]
fig, axes = _grouped_plot_by_column(plot_group, data, columns=columns,
by=by)
by=by, grid=grid)
ax = axes
else:
if ax is None:
ax = plt.gca()

data = data._get_numeric_data()
keys = [_stringify(x) for x in data.columns]
ax.boxplot(list(data.values.T))
if columns:
cols = columns
else:
cols = data.columns
keys = [_stringify(x) for x in cols]
ax.boxplot(list(data[cols].values.T))
ax.set_xticklabels(keys, rotation=rot, fontsize=fontsize)
ax.grid(grid)

plt.subplots_adjust(bottom=0.15, top=0.9, left=0.1, right=0.9, wspace=0.1)
return ax
Expand Down Expand Up @@ -108,7 +120,7 @@ def _grouped_plot(plotf, data, by=None, numeric_only=True):
return fig, axes

def _grouped_plot_by_column(plotf, data, columns=None, by=None,
numeric_only=True):
numeric_only=True, grid=False):
grouped = data.groupby(by)
if columns is None:
columns = data._get_numeric_data().columns - by
Expand All @@ -123,13 +135,17 @@ def _grouped_plot_by_column(plotf, data, columns=None, by=None,
else:
ravel_axes = []
for row in axes:
ravel_axes.extend(row)
if isinstance(row, plt.Axes):
ravel_axes.append(row)
else:
ravel_axes.extend(row)

for i, col in enumerate(columns):
ax = ravel_axes[i]
gp_col = grouped[col]
plotf(gp_col, ax)
ax.set_title(col)
ax.grid(grid)

fig.suptitle('Boxplot grouped by %s' % by)

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