x: The horizontal coordinates of the data points.
y: The vertical coordinates of the data points.
linestyle: Line style, also abbreviated as
ls. A list of available styles and how to customize them can be found here. Some of the most popular are
"-"for a solid line,
"--"for a dashed line, and
":"for a dotted line.
marker: Marker style. A complete list of available markers can be found here. Some of the most popular are
"o"for a circle,
"."for a point,
"^"for a triangle, etc.
Libraries & Data
# Libraries import matplotlib.pyplot as plt import numpy as np import pandas as pd # Set figure default figure size plt.rcParams["figure.figsize"] = (10, 6) # Create a random number generator for reproducibility rng = np.random.default_rng(1111) # Get some random points! x = np.array(range(10)) y = rng.integers(10, 100, 10) z = y + rng.integers(5, 20, 10)
plt.plot() generates a solid line plot. This function can also be used to obtain both a scatterplot and a lineplot at once by passing both the
linestyle and the
Default grouped connected scatterplot
plt.plot(x, z, linestyle="-", marker="o", label="Income") plt.plot(x, y, linestyle="-", marker="o", label="Expenses") plt.legend() plt.show()
Notice the legend generated automatically combines both lines and markers. This legend also reflects any customization we may apply.
Customize lines and markers
plt.plot( x, z, ls="--", lw=3, marker="X", markersize=10, markerfacecolor="red", markeredgecolor="black", label="Income" ) plt.plot( x, y, ls=":", marker="o", markersize=15, markerfacecolor="None", label="Expenses" ) plt.legend() plt.show()
If you want to have only either the line or the dot in the legend you can combine
plt.plot() giving the label to the one you want to include in the legend. For example:
plt.scatter(x, z, label="Income") plt.plot(x, z, ls="--") plt.scatter(x, y, label="Expenses") plt.plot(x, y, ls="--") plt.legend() plt.show()
Constructing the connected scatterplot component by component also gives us more flexibility to customize our plot. For example, it is possible to use different colors for the markers by passing a list of colors to the
color argument in
plt.plot(x, z) plt.scatter(x, z, color=["red", "black"] * 5, s=80, zorder=10) plt.show()
We would have obtained an error if we had passed
color=["red", "black"] * 5 to the