File reading question

[Hal Daume III]

Arrays or lists?

Lists is easier.

(transpose . map (map read . words) . lines) `liftM` readFile "file"

should do it (untested code, though).

On Fri, 12 Sep 2003, Gordon James Miller wrote:

> Hello all,
> 
> I believe I have a mental block on some issues related to IO and would
> really appreciate some help on this.  I have a text file that contains
> two columns of numbers, basically X and Y values.  I need a function (or
> set of functions) that reads this file and returns two arrays, one of
> the X values and one of the Y.  A sample data file might look like.
> 
> 10.0  20.0
> 20.0  40.0
> 30.0  60.0
> 40.0  80.0
> 
> Reading in this file should return two arrays [10.0, 20.0, 30.0, 40.0]
> and [20.0, 40.0, 60.0, 80.0].
> 
> Thanks for any help on this, I just don't seem to get IO in Haskell
> without reassignments.
> 
> 
> 
> Gordon James Miller Promisemark, Inc. Senior Computer Scientist
> gmiller at promisemark.com (571)330-9012 The box said "Requires Windows 95
> or better." So I installed LINUX
> 
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-- 
 Hal Daume III                                   | hdaume at isi.edu
 "Arrest this man, he talks in maths."           | www.isi.edu/~hdaume