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"""
=====================
Bar chart with labels
=====================
This example shows how to use the `~.Axes.bar_label` helper function
to create bar chart labels.
See also the :doc:`grouped bar
</gallery/lines_bars_and_markers/barchart>`,
:doc:`stacked bar
</gallery/lines_bars_and_markers/bar_stacked>` and
:doc:`horizontal bar chart
</gallery/lines_bars_and_markers/barh>` examples.
"""
import matplotlib.pyplot as plt
import numpy as np
# %%
# data from https://allisonhorst.github.io/palmerpenguins/
species = ('Adelie', 'Chinstrap', 'Gentoo')
sex_counts = {
'Male': np.array([73, 34, 61]),
'Female': np.array([73, 34, 58]),
}
width = 0.6 # the width of the bars: can also be len(x) sequence
fig, ax = plt.subplots()
bottom = np.zeros(3)
for sex, sex_count in sex_counts.items():
p = ax.bar(species, sex_count, width, label=sex, bottom=bottom)
bottom += sex_count
ax.bar_label(p, label_type='center')
ax.set_title('Number of penguins by sex')
ax.legend()
plt.show()
# %%
# Horizontal bar chart
# Fixing random state for reproducibility
np.random.seed(19680801)
# Example data
people = ('Tom', 'Dick', 'Harry', 'Slim', 'Jim')
y_pos = np.arange(len(people))
performance = 3 + 10 * np.random.rand(len(people))
error = np.random.rand(len(people))
fig, ax = plt.subplots()
hbars = ax.barh(y_pos, performance, xerr=error, align='center')
ax.set_yticks(y_pos, labels=people)
ax.invert_yaxis() # labels read top-to-bottom
ax.set_xlabel('Performance')
ax.set_title('How fast do you want to go today?')
# Label with specially formatted floats
ax.bar_label(hbars, fmt='%.2f')
ax.set_xlim(right=15) # adjust xlim to fit labels
plt.show()
# %%
# Some of the more advanced things that one can do with bar labels
fig, ax = plt.subplots()
hbars = ax.barh(y_pos, performance, xerr=error, align='center')
ax.set_yticks(y_pos, labels=people)
ax.invert_yaxis() # labels read top-to-bottom
ax.set_xlabel('Performance')
ax.set_title('How fast do you want to go today?')
# Label with given captions, custom padding and annotate options
ax.bar_label(hbars, labels=[f'±{e:.2f}' for e in error],
padding=8, color='b', fontsize=14)
ax.set_xlim(right=16)
plt.show()
# %%
# Bar labels using {}-style format string
fruit_names = ['Coffee', 'Salted Caramel', 'Pistachio']
fruit_counts = [4000, 2000, 7000]
fig, ax = plt.subplots()
bar_container = ax.bar(fruit_names, fruit_counts)
ax.set(ylabel='pints sold', title='Gelato sales by flavor', ylim=(0, 8000))
ax.bar_label(bar_container, fmt='{:,.0f}')
# %%
# Bar labels using a callable
animal_names = ['Lion', 'Gazelle', 'Cheetah']
mph_speed = [50, 60, 75]
fig, ax = plt.subplots()
bar_container = ax.bar(animal_names, mph_speed)
ax.set(ylabel='speed in MPH', title='Running speeds', ylim=(0, 80))
ax.bar_label(bar_container, fmt=lambda x: f'{x * 1.61:.1f} km/h')
# %%
#
# .. admonition:: References
#
# The use of the following functions, methods, classes and modules is shown
# in this example:
#
# - `matplotlib.axes.Axes.bar` / `matplotlib.pyplot.bar`
# - `matplotlib.axes.Axes.barh` / `matplotlib.pyplot.barh`
# - `matplotlib.axes.Axes.bar_label` / `matplotlib.pyplot.bar_label`
#
# .. tags::
#
# component: label
# plot-type: bar
# level: beginner
|
