pylab_examples example code: nan_test.py

(Source code, png)

#!/usr/bin/env python
"""
Example: simple line plots with NaNs inserted.
"""
from pylab import *
import numpy as np

t = arange(0.0, 1.0 + 0.01, 0.01)
s = cos(2*2*pi*t)
t[41:60] = NaN
#t[50:60] = np.inf

subplot(2, 1, 1)
plot(t, s, '-', lw=2)

xlabel('time (s)')
ylabel('voltage (mV)')
title('A sine wave with a gap of NaNs between 0.4 and 0.6')
grid(True)

subplot(2, 1, 2)
t[0] = NaN
t[-1] = NaN
plot(t, s, '-', lw=2)
title('Also with NaN in first and last point')

xlabel('time (s)')
ylabel('more nans')
grid(True)

show()

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