Dear Forum,
On Mar 21, 2011, at 5:17 AM, Igor Korepanov wrote:
> Dear Forum,
>
> When I worked in Maple, it was possible to define an identifier like f2 in
> such a way: first write
> n:=2;
> and then write f||n .
>
> That is, concatenate symbols to make an identifier for a variable or a
> function.
>
> Is something like that possible in GAP ?
Assuming you want these variables to be global variables, the easiest way
probably is
ASS_GVAR(string,value)
For example, you could use
ASS_GVAR("PiAppox",355/113);
or -- your example --
ASS_GVAR(Concatenation("f",String(3-1)), 12345 );
ASS_GVAR will overwrite variables without warning. there also is
ISBOUND_GVAR(string) and UNBIND_GLOBAL(string) to test or remove boundedness.
For generators of a free group or finitely presented group, there also is
`AssignGeneratorVariables'.
(Luca Giuzzi's code of course also will work and is essentially the only way
how one can do `eval(..)' for arbitrary string expressions.
Best,
Alexander Hulpke
-- Colorado State University, Department of Mathematics,
Weber Building, 1874 Campus Delivery, Fort Collins, CO 80523-1874, USA
email: hul...@math.colostate.edu, Phone: ++1-970-4914288
http://www.math.colostate.edu/~hulpke
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