Note
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Plotting multiple lines with a LineCollection#
Matplotlib can efficiently draw multiple lines at once using a
LineCollection
, as showcased below.
import matplotlib.pyplot as plt
from matplotlib.collections import LineCollection
import numpy as np
x = np.arange(100)
# Here are many sets of y to plot vs. x
ys = x[:50, np.newaxis] + x[np.newaxis, :]
segs = np.zeros((50, 100, 2))
segs[:, :, 1] = ys
segs[:, :, 0] = x
# Mask some values to test masked array support:
segs = np.ma.masked_where((segs > 50) & (segs < 60), segs)
# We need to set the plot limits, they will not autoscale
fig, ax = plt.subplots()
ax.set_xlim(x.min(), x.max())
ax.set_ylim(ys.min(), ys.max())
# *colors* is sequence of rgba tuples.
# *linestyle* is a string or dash tuple. Legal string values are
# solid|dashed|dashdot|dotted. The dash tuple is (offset, onoffseq) where
# onoffseq is an even length tuple of on and off ink in points. If linestyle
# is omitted, 'solid' is used.
# See `matplotlib.collections.LineCollection` for more information.
colors = plt.rcParams['axes.prop_cycle'].by_key()['color']
line_segments = LineCollection(segs, linewidths=(0.5, 1, 1.5, 2),
colors=colors, linestyle='solid')
ax.add_collection(line_segments)
ax.set_title('Line collection with masked arrays')
plt.show()
In the following example, instead of passing a list of colors
(colors=colors
), we pass an array of values (array=x
) that get
colormapped.
N = 50
x = np.arange(N)
ys = [x + i for i in x] # Many sets of y to plot vs. x
segs = [np.column_stack([x, y]) for y in ys]
fig, ax = plt.subplots()
ax.set_xlim(np.min(x), np.max(x))
ax.set_ylim(np.min(ys), np.max(ys))
line_segments = LineCollection(segs, array=x,
linewidths=(0.5, 1, 1.5, 2),
linestyles='solid')
ax.add_collection(line_segments)
axcb = fig.colorbar(line_segments)
axcb.set_label('Line Number')
ax.set_title('Line Collection with mapped colors')
plt.sci(line_segments) # This allows interactive changing of the colormap.
plt.show()
References
The use of the following functions, methods, classes and modules is shown in this example: