At Wednesday 13/12/2006 21:07, Chao wrote:
I've been trying to develop some numerical codes with python, however
got disappointed.
A very simple test,
a = 1.0
for i in range(1000):
for j in range(1000):
a = a+1
unfortunately, it took 4.5 seconds to finish(my machines is fine. P4
3.0G, 1G RAM, it varies according to machine configuration, but should
be in the same level)
How do you measure it? 4.5 secs is far too much. Anyway, try using
xrange instead of range. This is the standard way to do timings:
--- cut ---
def test():
a = 1.0
for i in xrange(1000):
for j in xrange(1000):
a = a+1
if __name__=='__main__':
from timeit import Timer
t = Timer("test()", "from __main__ import test")
print t.repeat(repeat=3,number=1)
--- cut ---
I got about 0.24 secs with far less hardware.
For vector-oriented operations the NumArray package is well suited.
--
Gabriel Genellina
Softlab SRL
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