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plotting.py
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plotting.py
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# being a bit too dynamic
# pylint: disable=E1101
from itertools import izip
import numpy as np
from pandas.util.decorators import cache_readonly
import pandas.core.common as com
from pandas.core.index import Index, MultiIndex
from pandas.core.series import Series
from pandas.tseries.frequencies import to_calendar_freq
from pandas.tseries.index import DatetimeIndex
from pandas.tseries.period import PeriodIndex
from pandas.tseries.offsets import DateOffset
import pandas.tseries.tools as datetools
def _get_standard_kind(kind):
return {'density' : 'kde'}.get(kind, kind)
def scatter_matrix(frame, alpha=0.5, figsize=None, ax=None, grid=False,
diagonal='hist', marker='.', **kwds):
"""
Draw a matrix of scatter plots.
Parameters
----------
alpha : amount of transparency applied
figsize : a tuple (width, height) in inches
ax : Matplotlib axis object
grid : setting this to True will show the grid
diagonal : pick between 'kde' and 'hist' for
either Kernel Density Estimation or Histogram
plon in the diagonal
kwds : other plotting keyword arguments
To be passed to scatter function
Examples
--------
>>> df = DataFrame(np.random.randn(1000, 4), columns=['A','B','C','D'])
>>> scatter_matrix(df, alpha=0.2)
"""
df = frame._get_numeric_data()
n = df.columns.size
fig, axes = _subplots(nrows=n, ncols=n, figsize=figsize, ax=ax,
squeeze=False)
# no gaps between subplots
fig.subplots_adjust(wspace=0, hspace=0)
mask = com.notnull(df)
for i, a in zip(range(n), df.columns):
for j, b in zip(range(n), df.columns):
if i == j:
values = df[a].values[mask[a].values]
# Deal with the diagonal by drawing a histogram there.
if diagonal == 'hist':
axes[i, j].hist(values)
elif diagonal in ('kde', 'density'):
from scipy.stats import gaussian_kde
y = values
gkde = gaussian_kde(y)
ind = np.linspace(y.min(), y.max(), 1000)
axes[i, j].plot(ind, gkde.evaluate(ind), **kwds)
else:
common = (mask[a] & mask[b]).values
axes[i, j].scatter(df[b][common], df[a][common],
marker=marker, alpha=alpha, **kwds)
axes[i, j].set_xlabel('')
axes[i, j].set_ylabel('')
axes[i, j].set_xticklabels([])
axes[i, j].set_yticklabels([])
ticks = df.index
is_datetype = ticks.inferred_type in ('datetime', 'date',
'datetime64')
if ticks.is_numeric() or is_datetype:
"""
Matplotlib supports numeric values or datetime objects as
xaxis values. Taking LBYL approach here, by the time
matplotlib raises exception when using non numeric/datetime
values for xaxis, several actions are already taken by plt.
"""
ticks = ticks._mpl_repr()
# setup labels
if i == 0 and j % 2 == 1:
axes[i, j].set_xlabel(b, visible=True)
#axes[i, j].xaxis.set_visible(True)
axes[i, j].set_xlabel(b)
axes[i, j].set_xticklabels(ticks)
axes[i, j].xaxis.set_ticks_position('top')
axes[i, j].xaxis.set_label_position('top')
if i == n - 1 and j % 2 == 0:
axes[i, j].set_xlabel(b, visible=True)
#axes[i, j].xaxis.set_visible(True)
axes[i, j].set_xlabel(b)
axes[i, j].set_xticklabels(ticks)
axes[i, j].xaxis.set_ticks_position('bottom')
axes[i, j].xaxis.set_label_position('bottom')
if j == 0 and i % 2 == 0:
axes[i, j].set_ylabel(a, visible=True)
#axes[i, j].yaxis.set_visible(True)
axes[i, j].set_ylabel(a)
axes[i, j].set_yticklabels(ticks)
axes[i, j].yaxis.set_ticks_position('left')
axes[i, j].yaxis.set_label_position('left')
if j == n - 1 and i % 2 == 1:
axes[i, j].set_ylabel(a, visible=True)
#axes[i, j].yaxis.set_visible(True)
axes[i, j].set_ylabel(a)
axes[i, j].set_yticklabels(ticks)
axes[i, j].yaxis.set_ticks_position('right')
axes[i, j].yaxis.set_label_position('right')
axes[i, j].grid(b=grid)
return axes
def _gca():
import matplotlib.pyplot as plt
return plt.gca()
def _gcf():
import matplotlib.pyplot as plt
return plt.gcf()
def andrews_curves(data, class_column, ax=None, samples=200):
"""
Parameters:
data: A DataFrame containing data to be plotted, preferably
normalized to (0.0, 1.0).
class_column: Name of the column containing class names.
samples: Number of points to plot in each curve.
"""
from math import sqrt, pi, sin, cos
import matplotlib.pyplot as plt
import random
def function(amplitudes):
def f(x):
x1 = amplitudes[0]
result = x1 / sqrt(2.0)
harmonic = 1.0
for x_even, x_odd in zip(amplitudes[1::2], amplitudes[2::2]):
result += (x_even * sin(harmonic * x) +
x_odd * cos(harmonic * x))
harmonic += 1.0
if len(amplitudes) % 2 != 0:
result += amplitudes[-1] * sin(harmonic * x)
return result
return f
def random_color(column):
random.seed(column)
return [random.random() for _ in range(3)]
n = len(data)
classes = set(data[class_column])
class_col = data[class_column]
columns = [data[col] for col in data.columns if (col != class_column)]
x = [-pi + 2.0 * pi * (t / float(samples)) for t in range(samples)]
used_legends = set([])
if ax == None:
ax = plt.gca(xlim=(-pi, pi))
for i in range(n):
row = [columns[c][i] for c in range(len(columns))]
f = function(row)
y = [f(t) for t in x]
label = None
if str(class_col[i]) not in used_legends:
label = str(class_col[i])
used_legends.add(label)
ax.plot(x, y, color=random_color(class_col[i]), label=label)
ax.legend(loc='upper right')
ax.grid()
return ax
def lag_plot(series, ax=None, **kwds):
"""Lag plot for time series.
Parameters:
-----------
series: Time series
ax: Matplotlib axis object, optional
kwds: Matplotlib scatter method keyword arguments, optional
Returns:
--------
ax: Matplotlib axis object
"""
import matplotlib.pyplot as plt
data = series.values
y1 = data[:-1]
y2 = data[1:]
if ax == None:
ax = plt.gca()
ax.set_xlabel("y(t)")
ax.set_ylabel("y(t + 1)")
ax.scatter(y1, y2, **kwds)
return ax
def probability_plot(series, ax=None, dist='norm', distargs=(), **kwds):
"""Probability plot for uni-variate data.
Parameters:
-----------
series: Time series
ax: Matplotlib axis object, optional
dist: Distribution name, one supported by scipy
http://docs.scipy.org/doc/scipy/reference/stats.html#continuous-distributions
distargs: Distribution specific parameters usually location and scale.
kwds: Matplotlib scatter method keyword arguments, optional
Returns:
--------
fig: Matplotlib figure object
"""
import matplotlib.pyplot as plt
from scipy.stats import probplot
if ax == None:
ax = plt.gca()
data = series.values
(x, y), (slope, intercept, _) = probplot(data, dist=dist, sparams=distargs)
ax.scatter(x, y, **kwds)
y1, y2 = ax.get_ylim()
x1, x2 = (y1 - intercept) / slope, (y2 - intercept) / slope
ax.plot([x1, x2], [y1, y2], color='grey')
ax.set_xlabel("Theoretical Quantiles")
ax.set_ylabel("Sample Quantiles")
return ax.get_figure()
def autocorrelation_plot(series, ax=None):
"""Autocorrelation plot for time series.
Parameters:
-----------
series: Time series
ax: Matplotlib axis object, optional
Returns:
-----------
ax: Matplotlib axis object
"""
import matplotlib.pyplot as plt
n = len(series)
data = np.asarray(series)
if ax == None:
ax = plt.gca(xlim=(1, n), ylim=(-1.0, 1.0))
mean = np.mean(data)
c0 = np.sum((data - mean) ** 2) / float(n)
def r(h):
return ((data[:n - h] - mean) * (data[h:] - mean)).sum() / float(n) / c0
x = np.arange(n) + 1
y = map(r, x)
z95 = 1.959963984540054
z99 = 2.5758293035489004
ax.axhline(y=z99/np.sqrt(n), linestyle='--', color='grey')
ax.axhline(y=z95/np.sqrt(n), color='grey')
ax.axhline(y=0.0, color='black')
ax.axhline(y=-z95/np.sqrt(n), color='grey')
ax.axhline(y=-z99/np.sqrt(n), linestyle='--', color='grey')
ax.set_xlabel("Lag")
ax.set_ylabel("Autocorrelation")
ax.plot(x, y)
ax.grid()
return ax
def grouped_hist(data, column=None, by=None, ax=None, bins=50, log=False,
figsize=None, layout=None, sharex=False, sharey=False,
rot=90):
"""
Returns
-------
fig : matplotlib.Figure
"""
# if isinstance(data, DataFrame):
# data = data[column]
def plot_group(group, ax):
ax.hist(group.dropna(), bins=bins)
fig, axes = _grouped_plot(plot_group, data, column=column,
by=by, sharex=sharex, sharey=sharey,
figsize=figsize, layout=layout, rot=rot)
fig.subplots_adjust(bottom=0.15, top=0.9, left=0.1, right=0.9,
hspace=0.3, wspace=0.2)
return fig
class MPLPlot(object):
"""
Base class for assembling a pandas plot using matplotlib
Parameters
----------
data :
"""
_default_rot = 0
_pop_attributes = ['label', 'style', 'logy', 'logx', 'loglog']
_attr_defaults = {'logy': False, 'logx': False, 'loglog': False}
def __init__(self, data, kind=None, by=None, subplots=False, sharex=True,
sharey=False, use_index=True,
figsize=None, grid=True, legend=True, rot=None,
ax=None, fig=None, title=None, xlim=None, ylim=None,
xticks=None, yticks=None,
sort_columns=False, fontsize=None, **kwds):
self.data = data
self.by = by
self.kind = kind
self.sort_columns = sort_columns
self.subplots = subplots
self.sharex = sharex
self.sharey = sharey
self.figsize = figsize
self.xticks = xticks
self.yticks = yticks
self.xlim = xlim
self.ylim = ylim
self.title = title
self.use_index = use_index
self.fontsize = fontsize
self.rot = rot
self.grid = grid
self.legend = legend
for attr in self._pop_attributes:
value = kwds.pop(attr, self._attr_defaults.get(attr, None))
setattr(self, attr, value)
self.ax = ax
self.fig = fig
self.axes = None
self.kwds = kwds
def _iter_data(self):
from pandas.core.frame import DataFrame
if isinstance(self.data, (Series, np.ndarray)):
yield com._stringify(self.label), np.asarray(self.data)
elif isinstance(self.data, DataFrame):
df = self.data
if self.sort_columns:
columns = com._try_sort(df.columns)
else:
columns = df.columns
for col in columns:
empty = df[col].count() == 0
# is this right?
values = df[col].values if not empty else np.zeros(len(df))
col = com._stringify(col)
yield col, values
@property
def nseries(self):
if self.data.ndim == 1:
return 1
else:
return self.data.shape[1]
def draw(self):
self.plt.draw_if_interactive()
def generate(self):
self._args_adjust()
self._compute_plot_data()
self._setup_subplots()
self._make_plot()
self._post_plot_logic()
self._adorn_subplots()
def _args_adjust(self):
pass
def _setup_subplots(self):
if self.subplots:
nrows, ncols = self._get_layout()
if self.ax is None:
fig, axes = _subplots(nrows=nrows, ncols=ncols,
sharex=self.sharex, sharey=self.sharey,
figsize=self.figsize)
else:
fig, axes = _subplots(nrows=nrows, ncols=ncols,
sharex=self.sharex, sharey=self.sharey,
figsize=self.figsize, ax=self.ax)
else:
if self.ax is None:
fig = self.plt.figure(figsize=self.figsize)
self.ax = fig.add_subplot(111)
else:
fig = self.ax.get_figure()
axes = [self.ax]
self.fig = fig
self.axes = axes
def _get_layout(self):
return (len(self.data.columns), 1)
def _compute_plot_data(self):
pass
def _make_plot(self):
raise NotImplementedError
def _post_plot_logic(self):
pass
def _adorn_subplots(self):
if self.subplots:
to_adorn = self.axes
else:
to_adorn = [self.ax]
# todo: sharex, sharey handling?
for ax in to_adorn:
if self.yticks is not None:
ax.set_yticks(self.yticks)
if self.xticks is not None:
ax.set_xticks(self.xticks)
if self.ylim is not None:
ax.set_ylim(self.ylim)
if self.xlim is not None:
ax.set_xlim(self.xlim)
ax.grid(self.grid)
if self.legend and not self.subplots:
self.ax.legend(loc='best', title=self.legend_title)
if self.title:
if self.subplots:
self.fig.suptitle(self.title)
else:
self.ax.set_title(self.title)
if self._need_to_set_index:
xticklabels = [_stringify(key) for key in self.data.index]
for ax_ in self.axes:
# ax_.set_xticks(self.xticks)
ax_.set_xticklabels(xticklabels, rotation=self.rot)
@property
def legend_title(self):
if hasattr(self.data, 'columns'):
if not isinstance(self.data.columns, MultiIndex):
name = self.data.columns.name
if name is not None:
name = str(name)
return name
else:
stringified = map(str, self.data.columns.names)
return ','.join(stringified)
else:
return None
@cache_readonly
def plt(self):
import matplotlib.pyplot as plt
return plt
_need_to_set_index = False
def _get_xticks(self):
index = self.data.index
is_datetype = index.inferred_type in ('datetime', 'date',
'datetime64')
if self.use_index:
if index.is_numeric() or is_datetype:
"""
Matplotlib supports numeric values or datetime objects as
xaxis values. Taking LBYL approach here, by the time
matplotlib raises exception when using non numeric/datetime
values for xaxis, several actions are already taken by plt.
"""
x = index._mpl_repr()
else:
self._need_to_set_index = True
x = range(len(index))
else:
x = range(len(index))
return x
def _get_plot_function(self):
if self.logy:
plotf = self.plt.Axes.semilogy
elif self.logx:
plotf = self.plt.Axes.semilogx
elif self.loglog:
plotf = self.plt.Axes.loglog
else:
plotf = self.plt.Axes.plot
return plotf
def _get_index_name(self):
if isinstance(self.data.index, MultiIndex):
name = self.data.index.names
if any(x is not None for x in name):
name = ','.join([str(x) for x in name])
else:
name = None
else:
name = self.data.index.name
if name is not None:
name = str(name)
return name
class KdePlot(MPLPlot):
def __init__(self, data, **kwargs):
MPLPlot.__init__(self, data, **kwargs)
def _make_plot(self):
from scipy.stats import gaussian_kde
plotf = self._get_plot_function()
for i, (label, y) in enumerate(self._iter_data()):
if self.subplots:
ax = self.axes[i]
style = 'k'
else:
style = '' # empty string ignored
ax = self.ax
if self.style:
style = self.style
gkde = gaussian_kde(y)
sample_range = max(y) - min(y)
ind = np.linspace(min(y) - 0.5 * sample_range,
max(y) + 0.5 * sample_range, 1000)
ax.set_ylabel("Density")
plotf(ax, ind, gkde.evaluate(ind), style, label=label, **self.kwds)
ax.grid(self.grid)
def _post_plot_logic(self):
df = self.data
if self.subplots and self.legend:
self.axes[0].legend(loc='best')
class DatetimeConverter(object):
@classmethod
def convert(cls, values, units, axis):
def try_parse(values):
try:
return datetools.to_datetime(values).toordinal()
except Exception:
return values
if (com.is_integer(values) or
com.is_float(values)):
return values
elif isinstance(values, str):
return try_parse(values)
elif isinstance(values, Index):
return values.map(try_parse)
return map(try_parse, values)
class LinePlot(MPLPlot):
def __init__(self, data, **kwargs):
MPLPlot.__init__(self, data, **kwargs)
@property
def has_ts_index(self):
from pandas.core.frame import DataFrame
if isinstance(self.data, (Series, DataFrame)):
if isinstance(self.data.index, (DatetimeIndex, PeriodIndex)):
has_freq = (hasattr(self.data.index, 'freq') and
self.data.index.freq is not None)
has_inferred = (hasattr(self.data.index, 'inferred_freq') and
self.data.index.inferred_freq is not None)
return has_freq or has_inferred
return False
def _make_plot(self):
# this is slightly deceptive
if self.use_index and self.has_ts_index:
data = self._maybe_convert_index(self.data)
self._make_ts_plot(data)
else:
x = self._get_xticks()
plotf = self._get_plot_function()
for i, (label, y) in enumerate(self._iter_data()):
if self.subplots:
ax = self.axes[i]
style = 'k'
else:
style = '' # empty string ignored
ax = self.ax
if self.style:
style = self.style
plotf(ax, x, y, style, label=label, **self.kwds)
ax.grid(self.grid)
idx = getattr(self.data, 'index', None)
if isinstance(idx, DatetimeIndex) or (idx is not None and
idx.inferred_type == 'datetime'):
ax.get_xaxis().converter = DatetimeConverter
def _maybe_convert_index(self, data):
# tsplot converts automatically, but don't want to convert index
# over and over for DataFrames
from pandas.core.frame import DataFrame
if (isinstance(data.index, DatetimeIndex) and
isinstance(data, DataFrame)):
freq = getattr(data.index, 'freqstr', None)
freq = to_calendar_freq(freq)
if freq is None and hasattr(data.index, 'inferred_freq'):
freq = data.index.inferred_freq
if isinstance(freq, DateOffset):
freq = freq.rule_code
data = DataFrame(data.values,
index=data.index.to_period(freq=freq),
columns=data.columns)
return data
def _make_ts_plot(self, data, **kwargs):
from pandas.tseries.plotting import tsplot
plotf = self._get_plot_function()
if isinstance(data, Series):
if self.subplots: # shouldn't even allow users to specify
ax = self.axes[0]
else:
ax = self.ax
label = com._stringify(self.label)
tsplot(data, plotf, ax=ax, label=label, style=self.style,
**kwargs)
ax.grid(self.grid)
else:
for i, col in enumerate(data.columns):
if self.subplots:
ax = self.axes[i]
else:
ax = self.ax
label = com._stringify(col)
tsplot(data[col], plotf, ax=ax, label=label, **kwargs)
ax.grid(self.grid)
# self.fig.subplots_adjust(wspace=0, hspace=0)
def _post_plot_logic(self):
df = self.data
if self.legend:
if self.subplots:
for ax in self.axes:
ax.legend(loc='best')
else:
self.axes[0].legend(loc='best')
condition = (not self.has_ts_index
and df.index.is_all_dates
and not self.subplots
or (self.subplots and self.sharex))
index_name = self._get_index_name()
for ax in self.axes:
if condition:
format_date_labels(ax)
if index_name is not None:
ax.set_xlabel(index_name)
class BarPlot(MPLPlot):
_default_rot = {'bar' : 90, 'barh' : 0}
def __init__(self, data, **kwargs):
self.stacked = kwargs.pop('stacked', False)
self.ax_pos = np.arange(len(data)) + 0.25
MPLPlot.__init__(self, data, **kwargs)
def _args_adjust(self):
if self.rot is None:
self.rot = self._default_rot[self.kind]
if self.fontsize is None:
if len(self.data) < 10:
self.fontsize = 12
else:
self.fontsize = 10
@property
def bar_f(self):
if self.kind == 'bar':
def f(ax, x, y, w, start=None, **kwds):
return ax.bar(x, y, w, bottom=start, **kwds)
elif self.kind == 'barh':
def f(ax, x, y, w, start=None, **kwds):
return ax.barh(x, y, w, left=start, **kwds)
else:
raise NotImplementedError
return f
def _make_plot(self):
colors = 'brgyk'
rects = []
labels = []
ax = self.axes[0]
bar_f = self.bar_f
pos_prior = neg_prior = np.zeros(len(self.data))
K = self.nseries
for i, (label, y) in enumerate(self._iter_data()):
kwds = self.kwds.copy()
if 'color' not in kwds:
kwds['color'] = colors[i % len(colors)]
if self.subplots:
ax = self.axes[i]
rect = bar_f(ax, self.ax_pos, y, 0.5, start=pos_prior,
linewidth=1, **kwds)
ax.set_title(label)
elif self.stacked:
mask = y > 0
start = np.where(mask, pos_prior, neg_prior)
rect = bar_f(ax, self.ax_pos, y, 0.5, start=start,
label=label, linewidth=1, **kwds)
pos_prior = pos_prior + np.where(mask, y, 0)
neg_prior = neg_prior + np.where(mask, 0, y)
else:
rect = bar_f(ax, self.ax_pos + i * 0.75 / K, y, 0.75 / K,
start=pos_prior, label=label, **kwds)
rects.append(rect)
labels.append(label)
if self.legend and not self.subplots:
patches =[r[0] for r in rects]
# Legend to the right of the plot
# ax.legend(patches, labels, bbox_to_anchor=(1.05, 1),
# loc=2, borderaxespad=0.)
# self.fig.subplots_adjust(right=0.80)
ax.legend(patches, labels, loc='best',
title=self.legend_title)
# self.fig.subplots_adjust(top=0.8, wspace=0, hspace=0)
def _post_plot_logic(self):
for ax in self.axes:
str_index = [_stringify(key) for key in self.data.index]
name = self._get_index_name()
if self.kind == 'bar':
ax.set_xlim([self.ax_pos[0] - 0.25, self.ax_pos[-1] + 1])
ax.set_xticks(self.ax_pos + 0.375)
ax.set_xticklabels(str_index, rotation=self.rot,
fontsize=self.fontsize)
ax.axhline(0, color='k', linestyle='--')
if name is not None:
ax.set_xlabel(name)
else:
# horizontal bars
ax.set_ylim([self.ax_pos[0] - 0.25, self.ax_pos[-1] + 1])
ax.set_yticks(self.ax_pos + 0.375)
ax.set_yticklabels(str_index, rotation=self.rot,
fontsize=self.fontsize)
ax.axvline(0, color='k', linestyle='--')
if name is not None:
ax.set_ylabel(name)
class BoxPlot(MPLPlot):
pass
class HistPlot(MPLPlot):
pass
def plot_frame(frame=None, subplots=False, sharex=True, sharey=False,
use_index=True,
figsize=None, grid=True, legend=True, rot=None,
ax=None, title=None,
xlim=None, ylim=None, logy=False,
xticks=None, yticks=None,
kind='line',
sort_columns=False, fontsize=None, **kwds):
"""
Make line or bar plot of DataFrame's series with the index on the x-axis
using matplotlib / pylab.
Parameters
----------
subplots : boolean, default False
Make separate subplots for each time series
sharex : boolean, default True
In case subplots=True, share x axis
sharey : boolean, default False
In case subplots=True, share y axis
use_index : boolean, default True
Use index as ticks for x axis
stacked : boolean, default False
If True, create stacked bar plot. Only valid for DataFrame input
sort_columns: boolean, default False
Sort column names to determine plot ordering
title : string
Title to use for the plot
grid : boolean, default True
Axis grid lines
legend : boolean, default True
Place legend on axis subplots
ax : matplotlib axis object, default None
kind : {'line', 'bar', 'barh'}
bar : vertical bar plot
barh : horizontal bar plot
logy : boolean, default False
For line plots, use log scaling on y axis
xticks : sequence
Values to use for the xticks
yticks : sequence
Values to use for the yticks
xlim : 2-tuple/list
ylim : 2-tuple/list
rot : int, default None
Rotation for ticks
kwds : keywords
Options to pass to matplotlib plotting method
Returns
-------
ax_or_axes : matplotlib.AxesSubplot or list of them
"""
kind = _get_standard_kind(kind.lower().strip())
if kind == 'line':
klass = LinePlot
elif kind in ('bar', 'barh'):
klass = BarPlot
elif kind == 'kde':
klass = KdePlot
else:
raise ValueError('Invalid chart type given %s' % kind)
plot_obj = klass(frame, kind=kind, subplots=subplots, rot=rot,
legend=legend, ax=ax, fontsize=fontsize,
use_index=use_index, sharex=sharex, sharey=sharey,
xticks=xticks, yticks=yticks, xlim=xlim, ylim=ylim,
title=title, grid=grid, figsize=figsize, logy=logy,
sort_columns=sort_columns, **kwds)
plot_obj.generate()
plot_obj.draw()
if subplots:
return plot_obj.axes
else:
return plot_obj.axes[0]
def plot_series(series, label=None, kind='line', use_index=True, rot=None,
xticks=None, yticks=None, xlim=None, ylim=None,
ax=None, style=None, grid=True, logy=False, **kwds):
"""
Plot the input series with the index on the x-axis using matplotlib
Parameters
----------
label : label argument to provide to plot
kind : {'line', 'bar'}
rot : int, default 30
Rotation for tick labels
use_index : boolean, default True
Plot index as axis tick labels
ax : matplotlib axis object
If not passed, uses gca()
style : string, default matplotlib default
matplotlib line style to use
ax : matplotlib axis object
If not passed, uses gca()
kind : {'line', 'bar', 'barh'}
bar : vertical bar plot
barh : horizontal bar plot
logy : boolean, default False
For line plots, use log scaling on y axis
xticks : sequence
Values to use for the xticks
yticks : sequence
Values to use for the yticks
xlim : 2-tuple/list
ylim : 2-tuple/list
rot : int, default None
Rotation for ticks
kwds : keywords
Options to pass to matplotlib plotting method
Notes
-----
See matplotlib documentation online for more on this subject
"""
kind = _get_standard_kind(kind.lower().strip())
if kind == 'line':
klass = LinePlot
elif kind in ('bar', 'barh'):
klass = BarPlot
elif kind == 'kde':
klass = KdePlot
if ax is None:
ax = _gca()
# is there harm in this?
if label is None:
label = series.name
plot_obj = klass(series, kind=kind, rot=rot, logy=logy,
ax=ax, use_index=use_index, style=style,
xticks=xticks, yticks=yticks, xlim=xlim, ylim=ylim,
legend=False, grid=grid, label=label, **kwds)
plot_obj.generate()
plot_obj.draw()
return plot_obj.ax
def boxplot(data, column=None, by=None, ax=None, fontsize=None,
rot=0, grid=True, figsize=None):
"""
Make a box plot from DataFrame column optionally grouped b ysome columns or
other inputs
Parameters
----------
data : DataFrame or Series
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
fontsize : int or string
Returns
-------
ax : matplotlib.axes.AxesSubplot
"""
from pandas import Series, DataFrame
if isinstance(data, Series):
data = DataFrame({'x' : data})
column = 'x'
def plot_group(grouped, ax):
keys, values = zip(*grouped)
keys = [_stringify(x) for x in keys]
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]
fig, axes = _grouped_plot_by_column(plot_group, data, columns=columns,
by=by, grid=grid, figsize=figsize)