8000 Fix cohere-demo by dstansby · Pull Request #7968 · matplotlib/matplotlib · GitHub
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Fix cohere-demo #7968

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Merged
merged 5 commits into from
Feb 8, 2017
Merged

Fix cohere-demo #7968

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9f5c27f
Fix cohere-demo
dstansby Jan 28, 2017
a54d257
Add exaple title to cohere_demo
dstansby Jan 29, 2017
7f81351
Move cohere_demo to lines_bars_and_markers
dstansby Jan 29, 2017
998af8b
Add in missing .py
dstansby Jan 29, 2017
f406d7d
Remove convolution from cohere_demo
dstansby Feb 7, 2017
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Fix cohere-demo
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@dstansby
dstansby committed Jan 28, 2017
commit 9f5c27f85c1fc45eaa3e7575d9f7285d2c8b5165
33 changes: 15 additions & 18 deletions examples/pylab_examples/cohere_demo.py
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Expand Up @@ -7,31 +7,28 @@
# Fixing random state for reproducibility
np.random.seed(19680801)


# make a little extra space between the subplots
plt.subplots_adjust(wspace=0.5)

dt = 0.01
t = np.arange(0, 30, dt)
nse1 = np.random.randn(len(t)) # white noise 1
nse2 = np.random.randn(len(t)) # white noise 2
r = np.exp(-t/0.05)
r = np.exp(-t / 0.05)

cnse1 = np.convolve(nse1, r, mode='same')*dt # colored noise 1
cnse2 = np.convolve(nse2, r, mode='same')*dt # colored noise 2
cnse1 = np.convolve(nse1, r, mode='same') * dt # colored noise 1
cnse2 = np.convolve(nse2, r, mode='same') * dt # colored noise 2

# two signals with a coherent part and a random part
s1 = 0.01*np.sin(2*np.pi*10*t) + cnse1
s2 = 0.01*np.sin(2*np.pi*10*t) + cnse2
s1 = 0.01 * np.sin(2 * np.pi * 10 * t) + cnse1
s2 = 0.01 * np.sin(2 * np.pi * 10 * t) + cnse2

fig, axs = plt.subplots(2, 1)
axs[0].plot(t, s1, t, s2)
axs[0].set_xlim(0, 5)
axs[0].set_xlabel('time')
axs[0].set_ylabel('s1 and s2')
axs[0].grid(True)

plt.subplot(211)
plt.plot(t, s1, t, s2)
plt.xlim(0, 5)
plt.xlabel('time')
plt.ylabel('s1 and s2')
plt.grid(True)
cxy, f = axs[1].cohere(s1, s2, 256, 1. / dt)
axs[1].set_ylabel('coherence')

plt.subplot(212)
cxy, f = plt.cohere(s1, s2, 256, 1./dt)
plt.ylabel('coherence')
fig.tight_layout()
plt.show()
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