[GAP Forum] Reading strongly regular graphs into GAP

[Robert Bailey]

Thanks for the reply.  I suspected that this might be the answer--the problem is I have no knowledge of perl or Python or such languages.

What I was hoping was that someone might have a suitable piece of code lying around already.....

Thanks again,
Robert.

----- Original Message -----
From: Mathieu Dutour <mathieu.dutour at gmail.com>
Date: Friday, March 22, 2013 2:53 pm
Subject: Re: [GAP Forum] Reading strongly regular graphs into GAP
To: Robert Bailey <robert.bailey at ryerson.ca>
Cc: GAP forum <forum at gap-system.org>


> The basic strategy in that case is that you write a perl
>  script that reads as input the file from Spence web page
>  and then write as output in a format that GAP can read.
>  
>  You can of course use Python or any other language that
>  has good text capabilities.
>  
>    Mathieu
>  
>  
>  On Fri, Mar 22, 2013 at 7:24 PM, Robert Bailey <robert.bailey at ryerson.ca>wrote:
>  
>  > Dear Forum,
>  >
>  > This is perhaps not strictly a GAP question, but anyway....
>  >
>  > I've been working on some computations in GAP (using the GRAPE and 
> other
>  > packages), testing certain properties of distance-regular and strongly
>  > regular graphs.  (I can go into more detail if necessary--but the
>  > SetOrbit package of Pech and Reichard has been especially useful.)
>  >
>  > There is an online catalogue of strongly regular graphs on Ted Spence's
>  > webpage:
>  > http://www.maths.gla.ac.uk/~es/srgraphs.php
>  >
>  > The graphs are given by their adjacency matrices; however, as given
>  > these matrices are not immediately readable by GAP.  Does anyone 
> know of
>  > an easy way to convert them into the right format (i.e. adding the
>  > commas and brackets)?  For cases where there are a small number of
>  > graphs, I've been able to do search/replace in a text editor to add 
> the
>  > commas, then add the brackets manually---but this isn't really feasible
>  > when there are 32,548 matrices of size 36x36.
>  >
>  > Thanks,
>  > Robert Bailey.
>  >
>  > --
>  > Dr. Robert Bailey
>  > Department of Mathematics
>  > Ryerson University
>  > 350 Victoria St.
>  > Toronto, Ontario M5B 2K3
>  > Canada
>  >
>  > Office: EPH 442B
>  > Telephone: +1 416-979-5000 x2874
>  > Web: www.math.ryerson.ca/~rbailey
>  >
>  >
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