array of array of float

[DH]

Summercoolness at gmail.com wrote:
> i used C too much and haven't used Python for a while...
> 
> like in C, if we want an array of array of float, we use
> 
> float a[200][500];
> 
> now in Python, seems like we have to do something like
> 
> a = [ [ ] ] * 200
> 
> and then just use
> 
> a[1].append(12.34)   etc
> 
> but it turns out that all 200 elements points to the same list...
> and i have to use
> 
> a = [ ]
> for i in range (0, 200):
>     a.append([ ])
> 
> is there a simpler way... i wonder...
> 

Right, try the numpy module, and you can do:

from numpy import *
a = zeros((200,500), Float)

documentation:
http://numeric.scipy.org/numpydoc/numpy-6.html#pgfId-60291
download:
http://sourceforge.net/project/showfiles.php?group_id=1369&package_id=175103
main page:
http://numeric.scipy.org/