On 10/12/05, Pujo Aji <[EMAIL PROTECTED]> wrote:
> I have code like this:
>
> def f(x,y):
> return math.sin(x*y) + 8 * x
>
> def main():
> n = 2000
> a = zeros((n,n), Float)
> xcoor = arange(0,1,1/float(n))
> ycoor = arange(0,1,1/float(n))
>
> for i in range(n):
> for j in range(n):
> a[i,j] = f(xcoor[i], ycoor[j]) # f(x,y) = sin(x*y) + 8*x
>
> print a[1000,1000]
>
> if __name__ == '__main__':
> main()
>
> I try to make this run faster even using psyco, but I found this still
> slow, I tried using java and found it around 13x faster...
>
> Can anybody help?
>
> pujo
are zeros() and arange() from NumPy or SciPy? i'll assume so, so
they're pretty fast already. on 1st glance, i would recommend using a
while loop instead of range(), which creates a data structure (list of
2000 elements) twice:
i = 0
while i < n:
j = 0
while j < n:
a[i,j] = f(xcoor[i], ycoor[j]) # f(x,y) = sin(x*y) + 8*x
j += 1
i += 1
there are probably other improvements that can be made. i also took
out your 'pass' stmt. :-)
HTH,
--wesley
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"Core Python Programming", Prentice Hall, (c)2006,2001
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wesley.j.chun :: wescpy-at-gmail.com
cyberweb.consulting : silicon valley, ca
http://cyberwebconsulting.com
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