"""
===================
Bar demo with units
===================

A plot using a variety of centimetre and inch conversions. This example shows
how default unit introspection works (ax1), how various keywords can be used to
set the x and y units to override the defaults (ax2, ax3, ax4) and how one can
set the xlimits using scalars (ax3, current units assumed) or units
(conversions applied to get the numbers to current units).

"""
import numpy as np
from basic_units import cm, inch
import matplotlib.pyplot as plt

cms = cm * np.arange(0, 10, 2)
bottom = 0 * cm
width = 0.8 * cm

fig, axs = plt.subplots(2, 2)

axs[0, 0].bar(cms, cms, bottom=bottom)

axs[0, 1].bar(cms, cms, bottom=bottom, width=width, xunits=cm, yunits=inch)

axs[1, 0].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=cm)
axs[1, 0].set_xlim(2, 6)  # scalars are interpreted in current units

axs[1, 1].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=inch)
axs[1, 1].set_xlim(2 * cm, 6 * cm)  # cm are converted to inches

fig.tight_layout()
plt.show() 

　このサンプルを実行するときに、basic_units_org.py が必要です。取り敢えず、実行時のカレント・ディレクトリに置けば動作します。

　

Traceback (most recent call last):
  File "C:\Users\kamif\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axis.py", line 1732, in convert_units
    ret = self.converter.convert(x, self.units, self)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "M:\______\basic_units.py", line 341, in convert
    if units.ConversionInterface.is_numlike(val):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'ConversionInterface' has no attribute 'is_numlike'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "M:\______\bar_demo2.py", line 23, in 
    axs[0, 0].bar(cms, cms, bottom=bottom)
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\__init__.py", line 1459, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axes\_axes.py", line 2406, in bar
    x = np.asarray(self.convert_xunits(x))
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\artist.py", line 281, in convert_xunits
    return ax.xaxis.convert_units(x)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\______\AppData\Local\Programs\Python\Python311\Lib
    \site-packages\matplotlib\axis.py", line 1734, in convert_units
    raise munits.ConversionError('Failed to convert value(s) to axis '
matplotlib.units.ConversionError: Failed to convert value(s) to axis units: 
  TaggedValue(array([0, 2, 4, 6, 8]), BasicUnit(cm)) 

Traceback (most recent call last):
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axis.py", 
    line 1769, in convert_units
    ret = self.converter.convert(x, self.units, self)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "E:\______\basic_units.py", line 341, in convert
    if units.ConversionInterface.is_numlike(val):
       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: type object 'ConversionInterface' has no attribute 'is_numlike'

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "E:\______\bar_demo2.py", line 23, in 
    axs[0, 0].bar(cms, cms, bottom=bottom)
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\__init__.py", 
    line 1478, in inner
    return func(ax, *map(sanitize_sequence, args), **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axes\_axes.py", 
    line 2446, in bar
    x = np.asarray(self.convert_xunits(x))
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\artist.py", 
    line 279, in convert_xunits
    return ax.xaxis.convert_units(x)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Program Files\Python312\Lib\site-packages\matplotlib\axis.py", 
    line 1771, in convert_units
    raise munits.ConversionError('Failed to convert value(s) to axis '
matplotlib.units.ConversionError: Failed to convert value(s) to axis units: 
  TaggedValue(array([0, 2, 4, 6, 8]), BasicUnit(cm)) 

"""
===================
Bar demo with units
===================

A plot using a variety of centimetre and inch conversions. This example shows
how default unit introspection works (ax1), how various keywords can be used to
set the x and y units to override the defaults (ax2, ax3, ax4) and how one can
set the xlimits using scalars (ax3, current units assumed) or units
(conversions applied to get the numbers to current units).

.. only:: builder_html

   This example requires :download:`basic_units.py `
"""
from basic_units import cm, inch

import matplotlib.pyplot as plt
import numpy as np

cms = cm * np.arange(0, 10, 2)
bottom = 0 * cm
width = 0.8 * cm

fig, axs = plt.subplots(2, 2)

axs[0, 0].bar(cms, cms, bottom=bottom)

axs[0, 1].bar(cms, cms, bottom=bottom, width=width, xunits=cm, yunits=inch)

axs[1, 0].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=cm)
axs[1, 0].set_xlim(2, 6)  # scalars are interpreted in current units

axs[1, 1].bar(cms, cms, bottom=bottom, width=width, xunits=inch, yunits=inch)
axs[1, 1].set_xlim(2 * cm, 6 * cm)  # cm are converted to inches

fig.tight_layout()
plt.show() 

　Python 3.11.6 (matplotlib 3.7.1) 及び Python 3.12.0 (matplotlib 3.8.1) 共に、正常実行です。
　このサンプルを実行するときに、basic_units.py が必要です。取り敢えず、実行時のカレント・ディレクトリに置けば動作します。

　

　basic_units.py を新しいのに、入れ替えると、元の bar_demo2.py でも、正常に実行できます。

　

• 2023/12/12 Ver=1.04 Python 3.12.0 (matplotlib 3.8.1)で確認
• 2023/12/12 Ver=1.04 Python 3.11.6 (matplotlib 3.7.1)で確認
• 2023/04/06 Ver=1.03 Python 3.11.2 で確認
• 2020/11/03 Ver=1.01 Python 3.7.8 で確認
• 2018/12/08 Ver=1.01 初版リリース

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