Re: [Numpy-discussion] reading matrix from a file

[Francesc A. <fa...@ca...>]

A Dimecres 08 Novembre 2006 13:42, amit soni escrigu=C3=A9:
> Hi,
>   i have a file with following format:
>  1 2
>  3 9
>  2 3
>  4 4
>    I want to read it and then store the values into two matrices, s.t.
>  A=3D[1 2;3 9]
>  B=3D[2 3;4 4]
>
>   Can anyone tell me how to do this in python?
>  thanks
>  Amit

There are many possibilities. One of them could be:

In [64]: a =3D []; b =3D []

In [65]: for i, line in enumerate(file("/tmp/data.txt")):
   ....:     if i < 2:
   ....:         a.extend([float(n) for n in line.split()])
   ....:     else:
   ....:         b.extend([float(n) for n in line.split()])
   ....:

In [66]: A=3Dnumpy.array(a).reshape(2,2); B=3Dnumpy.array(b).reshape(2,2)

In [67]: A, B
Out[67]:
(array([[ 1.,  2.],
       [ 3.,  9.]]),
 array([[ 2.,  3.],
       [ 4.,  4.]]))


HTH,

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>0,0<   Francesc Altet =C2=A0 =C2=A0 http://www.carabos.com/
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