Revision: 4013
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=4013&view=rev
Author: jdh2358
Date: 2007-10-26 10:43:50 -0700 (Fri, 26 Oct 2007)
Log Message:
-----------
added some figs for convolution example
Added Paths:
-----------
trunk/py4science/workbook/fig/convolve_deltas.eps
trunk/py4science/workbook/fig/convolve_deltas.png
trunk/py4science/workbook/scripts/
trunk/py4science/workbook/scripts/convolve_deltas.py
trunk/py4science/workbook/scripts/convolve_explain.py
Added: trunk/py4science/workbook/fig/convolve_deltas.eps
===================================================================
--- trunk/py4science/workbook/fig/convolve_deltas.eps
(rev 0)
+++ trunk/py4science/workbook/fig/convolve_deltas.eps 2007-10-26 17:43:50 UTC
(rev 4013)
@@ -0,0 +1,780 @@
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Added: trunk/py4science/workbook/fig/convolve_deltas.png
===================================================================
(Binary files differ)
Property changes on: trunk/py4science/workbook/fig/convolve_deltas.png
___________________________________________________________________
Name: svn:mime-type
+ application/octet-stream
Added: trunk/py4science/workbook/scripts/convolve_deltas.py
===================================================================
--- trunk/py4science/workbook/scripts/convolve_deltas.py
(rev 0)
+++ trunk/py4science/workbook/scripts/convolve_deltas.py 2007-10-26
17:43:50 UTC (rev 4013)
@@ -0,0 +1,18 @@
+import numpy as npy
+from pylab import figure, show
+
+dt = 0.025
+t = npy.arange(0.0, 0.5, dt)
+Nt = len(t)
+
+
+s = npy.exp(-2*t)*npy.cos(2*3*npy.pi*t)+1.0
+fig = figure()
+ax = fig.add_subplot(111)
+ax.plot(t, s, color='blue', lw=2)
+ax.bar(t-dt/8., s, facecolor='blue', width=dt/4.)
+ax.axhline(0, color='black', lw=2)
+ax.set_xlim(xmin=0)
+fig.savefig('convolve_deltas.png', dpi=150)
+fig.savefig('convolve_deltas.eps')
+show()
Added: trunk/py4science/workbook/scripts/convolve_explain.py
===================================================================
--- trunk/py4science/workbook/scripts/convolve_explain.py
(rev 0)
+++ trunk/py4science/workbook/scripts/convolve_explain.py 2007-10-26
17:43:50 UTC (rev 4013)
@@ -0,0 +1,48 @@
+import numpy as npy
+from pylab import figure, show
+
+dt = 0.01
+t = npy.arange(0.0, 10.0, dt)
+Nt = len(t)
+
+def impulse_response(t):
+ 'double exponential response function'
+ return (npy.exp(-t) - npy.exp(-5*t))
+
+i1 = npy.zeros(len(t))
+i2 = npy.zeros(len(t))
+i3 = npy.zeros(len(t))
+r = impulse_response(t)
+
+ind1, ind2, ind3 = 100, 300, 900
+i1[ind1] = 1
+i2[ind2] = 1.7
+i3[ind3] = 0.6
+
+y1 = npy.convolve(i1, r, mode='full')[:Nt]
+y2 = npy.convolve(i2, r, mode='full')[:Nt]
+y3 = npy.convolve(i3, r, mode='full')[:Nt]
+
+fig = figure()
+ax1 = ax = fig.add_subplot(311)
+ax.plot(t, r, 'k', lw=2)
+ax.set_ylabel('impulse response')
+
+ax = fig.add_subplot(312, sharex=ax1)
+ax.bar(t[ind1], i1[ind1], facecolor='blue', lw=2, edgecolor='blue', width=3*dt)
+ax.bar(t[ind2], i2[ind2], facecolor='green', lw=2, edgecolor='green',
width=3*dt)
+ax.bar(t[ind3], i3[ind3], facecolor='red', lw=2, edgecolor='red', width=3*dt)
+ax.plot(t, y1, color='blue', lw=1, label='input 1')
+ax.plot(t, y2, color='green', lw=1, label='input 2')
+ax.plot(t, y3, color='red', lw=1, label='input d')
+ax.set_ylabel('3 inputs')
+
+
+ax = fig.add_subplot(313, sharex=ax1)
+ax.plot(t, y1+y2+y3, color='black', lw=2, label='sum')
+ax.set_ylabel('output')
+#ax.legend(loc='best')
+
+fig.savefig('../fig/convolve_inputs.png', dpi=150)
+fig.savefig('../fig/convolve_inputs.eps')
+show()
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