Revision: 3627
http://matplotlib.svn.sourceforge.net/matplotlib/?rev=3627&view=rev
Author: fer_perez
Date: 2007-07-29 01:03:12 -0700 (Sun, 29 Jul 2007)
Log Message:
-----------
Small optimization.
Modified Paths:
--------------
trunk/py4science/examples/schrodinger/schrod_fdtd.py
Modified: trunk/py4science/examples/schrodinger/schrod_fdtd.py
===================================================================
--- trunk/py4science/examples/schrodinger/schrod_fdtd.py 2007-07-29
06:50:34 UTC (rev 3626)
+++ trunk/py4science/examples/schrodinger/schrod_fdtd.py 2007-07-29
08:03:12 UTC (rev 3627)
@@ -237,22 +237,26 @@
IDX2 = range(2,N) # psi [ k + 1 ]
IDX3 = range(0,N-2) # psi [ k - 1 ]
-for t in range(0,T+1):
+for t in range(T+1):
+ # Precompute a couple of indexing constants, this speeds up the computation
+ psi_rPR = psi_r[PR]
+ psi_iPR = psi_i[PR]
+
# Apply the update equations.
psi_i[FU,IDX1] = psi_i[PA,IDX1] + \
- c1*(psi_r[PR,IDX2] - 2*psi_r[PR,IDX1] +
- psi_r[PR,IDX3])
- psi_i[FU] = psi_i[FU] - c2V*psi_r[PR]
+ c1*(psi_rPR[IDX2] - 2*psi_rPR[IDX1] +
+ psi_rPR[IDX3])
+ psi_i[FU] -= c2V*psi_r[PR]
psi_r[FU,IDX1] = psi_r[PA,IDX1] - \
- c1*(psi_i[PR,IDX2] - 2*psi_i[PR,IDX1] +
- psi_i[PR,IDX3])
- psi_r[FU] = psi_r[FU] + c2V*psi_i[PR]
+ c1*(psi_iPR[IDX2] - 2*psi_iPR[IDX1] +
+ psi_iPR[IDX3])
+ psi_r[FU] += c2V*psi_i[PR]
# Increment the time steps. PR -> PA and FU -> PR
- psi_r[PA] = psi_r[PR]
+ psi_r[PA] = psi_rPR
psi_r[PR] = psi_r[FU]
- psi_i[PA] = psi_i[PR]
+ psi_i[PA] = psi_iPR
psi_i[PR] = psi_i[FU]
# Only plot after a few iterations to make the simulation run faster.
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