[GAP Forum] Reading group elements from CSV file

[Dmitrii (Dima) Pasechnik]

On 13 August 2013 08:59, Ha T. Lam <hatlam at gmail.com> wrote:
> Dear GAP forum,
>
> I saved the output of some computation as a csv file consisting of group
> elements, like so:
>
> a,b,c
> g2,g1^2,g1^-1*g2*g3^-2
>
> Now I want to read these elements back and use them as group elements for
> the group g:=DihedralGroup(8). I used ReadCSV(filename). First I realized
> that group elements need to be referred to as g.1, g.2, etc. An easy search
> and replace with my text editor took care of that, so now my csv file looks
> like:
>
> a,b,c
> g.2,g.1^2,g.1^-1*g.2*g.3^-2
>
> But what I get back is actually a list of records consisting of strings,
> not actually group elements. How do I evaluate these strings so that GAP
> knows that I'm referring to the group elements instead?

There is the EvalString function that lets you evaluate GAP expressions which
are built up as strings.

Hope this helps,
Dmitrii

>
> Thank you for your help.
>
> Ha T. Lam
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