speed of python vs matlab.

[Chao]

My Bad,  the time used by python is 0.46~0.49 sec,
I tried xrange, but it doesn't make things better.

import time
tic = time.time()
a = 1.0

array = range(1000)

for i in array:
    for j in array:
	a = a + 0.1

toc = time.time()
print toc-tic,' has elapsed'

used by matlab is 0.012sec

tic
a = 1;
for i=1:1000
    for j=1:1000
        a = a + 1;
    end
end
toc

used by ruby is 0.94~0.96sec

a = 1
start = Time.now()

1000.times do
  1000.times do
    a = a + 1
  end
end

finish = Time.now()

puts finish - start


Andrew Sackville-West wrote:
> On Wed, Dec 13, 2006 at 04:07:20PM -0800, 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)
>
> somethings not right there.
>
> andrew at debian:~$ cat pytimetest.py
> a=1.0
> for i in range (1000):
>     for j in range (1000):
>          a=a+1
>
>
> andrew at debian:~$ time python pytimetest.py
>
> real    0m0.534s
> user    0m0.528s
> sys     0m0.000s
>
>
> andrew at debian:~$ cat /proc/cpuinfo  | grep name
> model name      : Intel(R) Celeron(R) CPU 2.53GHz
>
> andrew at debian:~$ uname -a
> Linux debian 2.6.18-3-686 #1 SMP Mon Dec 4 16:41:14 UTC 2006 i686
> GNU/Linux
>
> A
>
> --7AUc2qLy4jB3hD7Z
> Content-Type: application/pgp-signature
> Content-Disposition: inline;
> 	filename="signature.asc"
> Content-Description: Digital signature
> X-Google-AttachSize: 190