how to read in an array in text file?

[Bengt Richter]

On Sun, 9 Nov 2003 12:17:39 +0100, "Ulrich Petri" <ulope at gmx.de> wrote:

>"Yun Mao" <maoy at cis.upenn.edu> schrieb im Newsbeitrag
>news:bokiea$bn00$1 at netnews.upenn.edu...
>> Hi, what's the easy way of reading in a two-dimentional array from a text
>> file?
>> The text file looks like this:
>> 0.1 1.1 2.3 12.1
>> 0.3 33.0 4.1 1.1
>>
>> I'm using Numeric Python now. Other solutions are also welcome. Thanks a
>> lot!
>> Yun
>
>f = file("myfile", "r")
>data = [line.split() for line in f]
 # or (untested), to get floats when you access data[row][col]
 data = [map(float,line.split()) for line in f]

>f.close()
>

Hate to leave that "(untested)" ... so, simulating the file with StringIO...

 >>> from StringIO import StringIO
 >>> f = StringIO("""\
 ... 0.1 1.1 2.3 12.1
 ... 0.3 33.0 4.1 1.1
 ... """)
 >>> data = [map(float,line.split()) for line in f]
 >>> data
 [[0.10000000000000001, 1.1000000000000001, 2.2999999999999998, 12.1], [0.29999999999999999, 33.0
 , 4.0999999999999996, 1.1000000000000001]]

 >>> for row in data:
 ...     for colitem in row: print '%10.3f' %colitem,
 ...     print
 ...
      0.100      1.100      2.300     12.100
      0.300     33.000      4.100      1.100

Regards,
Bengt Richter