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nschloe/matplotx: :bar_chart: More styles and useful extensions for Matplotlib

Some useful extensions for Matplotlib.

This package includes some useful or beautiful extensions to Matplotlib. Most of those features could be in Matplotlib itself, but I haven't had time to PR yet. If you're eager, let me know and I'll support the effort.

Install with

pip install matplotx[all]

and use in Python with

See below for what matplotx can do.

The middle plot is created with

import matplotlib.pyplot as plt
import matplotx
import numpy as np

# create data
rng = np.random.default_rng(0)
offsets = [1.0, 1.50, 1.60]
labels = ["no balancing", "CRV-27", "CRV-27*"]
x0 = np.linspace(0.0, 3.0, 100)
y = [offset * x0 / (x0 + 1) + 0.1 * rng.random(len(x0)) for offset in offsets]

# plot
with plt.style.context(matplotx.styles.dufte):
    for yy, label in zip(y, labels):
        plt.plot(x0, yy, label=label)
    plt.xlabel("distance [m]")
    matplotx.ylabel_top("voltage [V]")  # move ylabel to the top, rotate
    matplotx.line_labels()  # line labels to the right
    plt.show()

The three matplotx ingredients are:

You can also "duftify" any other style (see below) with

matplotx.styles.duftify(matplotx.styles.dracula)

Further reading and other styles:

The right plot is created with

import matplotlib.pyplot as plt
import matplotx

labels = ["Australia", "Brazil", "China", "Germany", "Mexico", "United\nStates"]
vals = [21.65, 24.5, 6.95, 8.40, 21.00, 8.55]
xpos = range(len(vals))

with plt.style.context(matplotx.styles.dufte_bar):
    plt.bar(xpos, vals)
    plt.xticks(xpos, labels)
    matplotx.show_bar_values("{:.2f}")
    plt.title("average temperature [°C]")
    plt.show()

The two matplotx ingredients are:

matplotx contains numerous extra color schemes, e.g., Dracula, Nord, gruvbox, and Solarized, the revised Tableau colors.

import matplotlib.pyplot as plt
import matplotx

# use everywhere:
plt.style.use(matplotx.styles.dracula)

# use with context:
with plt.style.context(matplotx.styles.dracula):
    pass
Many more styles here...

Other styles:

Sometimes, the sharp edges of contour[f] plots don't accurately represent the smoothness of the function in question. Smooth contours, contours(), serves as a drop-in replacement.

import matplotlib.pyplot as plt
import matplotx


def rosenbrock(x):
    return (1.0 - x[0]) ** 2 + 100.0 * (x[1] - x[0] ** 2) ** 2


im = matplotx.contours(
    rosenbrock,
    (-3.0, 3.0, 200),
    (-1.0, 3.0, 200),
    log_scaling=True,
    cmap="viridis",
    outline="white",
)
plt.gca().set_aspect("equal")
plt.colorbar(im)
plt.show()
Contour plots for functions with discontinuities

Matplotlib has problems with contour plots of functions that have discontinuities. The software has no way to tell discontinuities and very sharp, but continuous cliffs apart, and contour lines will be drawn along the discontinuity.

matplotx improves upon this by adding the parameter max_jump. If the difference between two function values in the grid is larger than max_jump, a discontinuity is assumed and no line is drawn. Similarly, min_jump can be used to highlight the discontinuity.

As an example, take the function imag(log(Z)) for complex values Z. Matplotlib's contour lines along the negative real axis are wrong.

import matplotlib.pyplot as plt
import numpy as np

import matplotx

x = np.linspace(-2.0, 2.0, 100)
y = np.linspace(-2.0, 2.0, 100)

X, Y = np.meshgrid(x, y)
Z = X + 1j * Y

vals = np.imag(np.log(Z))

# plt.contour(X, Y, vals, levels=[-2.0, -1.0, 0.0, 1.0, 2.0])  # draws wrong lines

matplotx.contour(X, Y, vals, levels=[-2.0, -1.0, 0.0, 1.0, 2.0], max_jump=1.0)
matplotx.discontour(X, Y, vals, min_jump=1.0, linestyle=":", color="r")

plt.gca().set_aspect("equal")
plt.show()

Relevant discussions:

Show sparsity patterns of sparse matrices or write them to image files.

Example:

import matplotx
from scipy import sparse

A = sparse.rand(20, 20, density=0.1)

# show the matrix
plt = matplotx.spy(
    A,
    # border_width=2,
    # border_color="red",
    # colormap="viridis"
)
plt.show()

# or save it as png
matplotx.spy(A, filename="out.png")

There is a command-line tool that can be used to show matrix-market or Harwell-Boeing files:

matplotx spy msc00726.mtx [out.png]

See matplotx spy -h for all options.

This software is published under the MIT license.

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