You are reading an old version of the documentation (v1.4.3). For the latest version see

We're updating the default styles for Matplotlib 2.0

Learn what to expect in the new updates


Previous topic

pylab_examples example code:

Next topic

pylab_examples example code:

This Page

pylab_examples example code: masked_demo.pyΒΆ

(Source code, png, hires.png, pdf)

#!/usr/bin/env python
Plot lines with points masked out.

This would typically be used with gappy data, to
break the line at the data gaps.

from pylab import *

x = ma.arange(0, 2*pi, 0.02)
y = ma.sin(x)
y1 = sin(2*x)
y2 = sin(3*x)
ym1 = ma.masked_where(y1 > 0.5, y1)
ym2 = ma.masked_where(y2 < -0.5, y2)

lines = plot(x, y, 'r', x, ym1, 'g', x, ym2, 'bo')
setp(lines[0], linewidth = 4)
setp(lines[1], linewidth = 2)
setp(lines[2], markersize = 10)

legend( ('No mask', 'Masked if > 0.5', 'Masked if < -0.5') ,
        loc = 'upper right')
title('Masked line demo')

Keywords: python, matplotlib, pylab, example, codex (see Search examples)