read data from a file to an array in python

[adamsnative]

Hi
I am having some numeric values in a file , every row is having the same number of values ie suppose 5 values in each row n 10 rows of data so data is in a 10X5 pattern.
How can i read this data into an array . I am using numpy and sci pi modules with python 2.5.Plz help its urgent n very important

[ssam]

have a look at http://www.scipy.org/Cookbook/InputOutput that has some examples.

[adamsnative]

the link you gave is a very old one and python 2.5 is giving errors with it. So plz help with some other resorces and i will be happy if u can give an example

[mnemonik]

pretty sure you could do something like this (not one hundred percent on my use but I know .readlines() sends it to a list which is the python equivalent of an array afaik, i'm new with this stuff too)


inList = raw_input("Type the filename: ")

in_file = open(inList, "r")
list = in_file.readlines()
in_file.close()

[WW]

the link you gave is a very old one and python 2.5 is giving errors with it. So plz help with some other resorces and i will be happy if u can give an example
What errors do you get? loadtxt() (http://www.scipy.org/Numpy_Example_List_With_Doc#head-88ade192dacf0c15e4f1377096134ee559df07a0) works for me:


$ cat data.txt
1.0 2.0 3.0
4.0 5.0 6.0
7.0 8.0 9.0
10.0 11.0 12.0
13.0 14.0 15.0
$ cat data.csv
1.0, 2.0, 3.0
4.0, 5.0, 6.0
7.0, 8.0, 9.0
10.0, 11.0, 12.0
13.0, 14.0, 15.0
$ python
EPD Py25 (4.1.30101) -- http://www.enthought.com/epd

Python 2.5.2 |EPD Py25 4.1.30101| (r252:60911, Dec 19 2008, 15:28:32)
[GCC 4.0.1 (Apple Computer, Inc. build 5370)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
>>> a = numpy.loadtxt('data.txt')
>>> a
array([[ 1., 2., 3.],
[ 4., 5., 6.],
[ 7., 8., 9.],
[ 10., 11., 12.],
[ 13., 14., 15.]])
>>> b = numpy.loadtxt('data.csv',delimiter=',')
>>> b
array([[ 1., 2., 3.],
[ 4., 5., 6.],
[ 7., 8., 9.],
[ 10., 11., 12.],
[ 13., 14., 15.]])
>>>

[Martin Witte]

or in just plain python


martin@toshibap200:~$ cat data.txt
1.0 2.0 3.0
4.0 5.0 6.0
7.0 8.0 9.0
10.0 11.0 12.0
13.0 14.0 15.0




martin@toshibap200:~$ python
Python 2.5.2 (r252:60911, Oct 5 2008, 19:24:49)
[GCC 4.3.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open('data.txt')
>>> d = f.readlines()
>>> print [x.split() for x in d]
[['1.0', '2.0', '3.0'], ['4.0', '5.0', '6.0'], ['7.0', '8.0', '9.0'], ['10.0', '11.0', '12.0'], ['13.0', '14.0', '15.0'], []]
>>> f.close()
>>>