How to get data from matplotlib bar chart

Question

How does one retrieve data programmatically from a matplotlib bar chart? I can do it for a matplotlib line chart as follows, so maybe I'm fairly close:

import matplotlib.pyplot as plt

plt.plot([1,2,3],[4,5,6])

axis = plt.gca()
line = axis.lines[0]
x_plot, y_plot = line.get_xydata().T
print("x_plot: ", x_plot)
print("y_plot: ", y_plot)

for a bar chart, however, there are no lines, and I'm unclear what the equivalent object is:

plt.bar([1,2,3], [4,5,6])
axis = plt.gca()
???

FWIW, here are a couple of related postings (that don't go into bar charts):

Trenton McKinney · Accepted Answer · 2020-08-14T00:17:45.373

1

The API for matplotlib.pyplot.bar returns a BarContainer object
- matplotlib.patches.Rectangle provides a full accounting of the Patch methods.
- This object is iterable, and the various location components can be extracted with the appropriate methods, as shown below.

import matplotlib.pyplot as plt

rects = plt.bar([1,2,3], [4,5,6])

for rect in rects:
    print(rect)
    xy = rect.get_xy()
    x = rect.get_x()
    y = rect.get_y()
    height = rect.get_height()
    width = rect.get_width()

[out]:
Rectangle(xy=(0.6, 0), width=0.8, height=4, angle=0)
Rectangle(xy=(1.6, 0), width=0.8, height=5, angle=0)
Rectangle(xy=(2.6, 0), width=0.8, height=6, angle=0)

edited Aug 14 '20 at 00:17

answered Aug 13 '20 at 23:54

Trenton McKinney

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As a followup, is there way to get the BarContainer from the plot object, not the return of calling "bar"? – siddarfer Aug 14 '20 at 13:29
1

nevermind, found the answer: ax = plot.gca() con = ax.containers print(con) from https://stackoverflow.com/questions/62189677/how-to-get-a-barcontainer-object-from-an-axessubplot-object-in-matplotllib – siddarfer Aug 14 '20 at 13:33

How to get data from matplotlib bar chart

1 Answers1