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.. _plotting:
Plotting with Matplotlib
========================
Matplotlib_ is a Python plotting library that produces a wide range of plot types
with publication-quality images and support for typesetting mathematical formulas.
Starting with Matplotlib 2.0, **Quantity** instances can be used with matplotlib's
support for units when plotting. To do so, the support must be manually enabled on
a **UnitRegistry**:
.. testsetup:: *
import pint
ureg = pint.UnitRegistry()
.. doctest::
>>> import pint
>>> ureg = pint.UnitRegistry()
>>> ureg.setup_matplotlib()
This support can also be disabled with:
.. doctest::
>>> ureg.setup_matplotlib(False)
This allows plotting quantities with different units:
.. plot::
:include-source: true
import matplotlib.pyplot as plt
import numpy as np
import pint
ureg = pint.UnitRegistry()
ureg.setup_matplotlib(True)
y = np.linspace(0, 30) * ureg.miles
x = np.linspace(0, 5) * ureg.hours
fig, ax = plt.subplots()
ax.plot(x, y, 'tab:blue')
ax.axhline(26400 * ureg.feet, color='tab:red')
ax.axvline(120 * ureg.minutes, color='tab:green')
This also allows controlling the actual plotting units for the x and y axes:
.. plot::
:include-source: true
import matplotlib.pyplot as plt
import numpy as np
import pint
ureg = pint.UnitRegistry()
ureg.setup_matplotlib(True)
y = np.linspace(0, 30) * ureg.miles
x = np.linspace(0, 5) * ureg.hours
fig, ax = plt.subplots()
ax.yaxis.set_units(ureg.inches)
ax.xaxis.set_units(ureg.seconds)
ax.plot(x, y, 'tab:blue')
ax.axhline(26400 * ureg.feet, color='tab:red')
ax.axvline(120 * ureg.minutes, color='tab:green')
Users have the possibility to change the format of the units on the plot:
.. plot::
:include-source: true
import matplotlib.pyplot as plt
import numpy as np
import pint
ureg = pint.UnitRegistry()
ureg.setup_matplotlib(True)
ureg.mpl_formatter = "{:~P}"
y = np.linspace(0, 30) * ureg.miles
x = np.linspace(0, 5) * ureg.hours
fig, ax = plt.subplots()
ax.yaxis.set_units(ureg.inches)
ax.xaxis.set_units(ureg.seconds)
ax.plot(x, y, 'tab:blue')
ax.axhline(26400 * ureg.feet, color='tab:red')
ax.axvline(120 * ureg.minutes, color='tab:green')
For more information, visit the Matplotlib_ home page.
.. _Matplotlib: https://matplotlib.org
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