Re: Python arrays and sting formatting options

Grant Edwards wrote:
On 2008-09-30, Peter Pearson <ppearson@xxxxxxxxxxxxxxx> wrote:
On Tue, 30 Sep 2008 00:04:18 +0200, Ivan Rebori wrote:
1. Multi dimensional arrays - how do you load them in python
For example, if I had:
-------
1 2 3
4 5 6
7 8 9

10 11 12
13 14 15
16 17 18
-------
with "i" being the row number, "j" the column number, and "k" the ..
uhmm, well, the "group" number, how would you load this ?

If fortran90 you would just do:

do 10 k=1,2
do 20 i=1,3

read(*,*)(a(i,j,k),j=1,3)

20 continue
10 continue

How would the python equivalent go ?

You would drag yourself out of the 1960s, install numpy, and
then do something like this:

a = read_array(open("filename.dat","r"))

Since you're coming from the FORTRAN world (thank you for that
stroll down Memory Lane), you might be doing scientific
computations, and so might be interested in the SciPy package
(Google scipy), which gives you arrays and matrices. Don't
expect to be able to use it without learning some Python,
though.

If not full-up scipy (which provides all sorts of scientific
and numerical-analysis stuff), then at least numpy (which
provides the basic array/matrix operations:

http://numpy.scipy.org/

Though the software is free, the documentation isn't. You've
got to buy the book if you want something to read. IMO, it's
definitely worth it, and a good way to support the project even
if you don't really need something to keep your bookends apart.
clip ...
The book is free now, as of Aug 21, 08.
http://www.tramy.us/guidetoscipy.html

Paul Probert
.

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