How to plot quantities with matplotlib

How to plot quantities with matplotlib#

This guide shows you how to plot unxt.Quantity objects with matplotlib.

Setup#

Importing unxts.interop.matplotlib registers a matplotlib.units.ConversionInterface for unxt.quantity.AbstractQuantity (so Quantity and the other quantity types work). unxt imports the package automatically when it is installed, so plotting usually just works once the package is present:

import matplotlib.pyplot as plt
import unxt as u

Plotting quantities#

Pass Quantity objects straight to matplotlib — the registered converter strips the units to their magnitudes for the axes:

import jax.numpy as jnp

x = u.Q(jnp.linspace(0, 360, 100), "deg")
y = u.Q(jnp.sin(x.ustrip("rad")), "")

fig, ax = plt.subplots()
ax.plot(x, y)

Using quaxed.numpy#

With quaxed’s unit-aware numpy namespace, the intermediate values stay Quantity objects and units propagate through the computation:

import quaxed.numpy as jnp

x = u.Q(jnp.linspace(0, 360, 100), "deg")
y = jnp.sin(x)

fig, ax = plt.subplots()
ax.plot(x, y)

Disabling the converter#

The converter is enabled on import. To turn it off (or back on) at runtime, use setup_matplotlib_support_for_unxt — see the API reference:

from unxts.interop.matplotlib import setup_matplotlib_support_for_unxt

setup_matplotlib_support_for_unxt(enable=False)  # stop converting Quantity
setup_matplotlib_support_for_unxt(enable=True)  # re-enable

See also#