[GAP Forum] Unbound global variable error

[Ha T. Lam]

That is exactly the problem. Thank you very much!

Ha

On Thu, Aug 30, 2012 at 4:32 PM, Vipul Naik <vipul at math.uchicago.edu> wrote:

> Hello,
>
> It is probably the ordering of your function definitions within the
> file. Try placing the definition of Foo2 above the definition of Foo1.
>
> GAP reads the file linearly. This means that when it reads Foo1, it
> doesn't know what Foo2 is because that point in the file hasn't been
> reached yet.
>
> If you don't want to change the order of the definitions, the problem
> can be overcome by reading the file twice, as at the second read of
> the file, GAP "knows" what Foo2 is.
>
> Vipul
> * Quoting Ha T. Lam who at 2012-08-30 16:17:18+0000 (Thu) wrote
> > Sorry if I double-post this question. I emailed the forum unsubscribed
> and
> > have been waited moderating for a week. I thought I would try my chance
> > again as a member.
> >
> > Dear GAP forum,
> > >
> > > I'm getting the unbound global variable error when I put the following
> in
> > > a file and Read it in:
> > > -------------------------------------------
> > > Foo1:=function()
> > > local g;
> > >     g:=2;
> > >     Foo2(g);
> > > end;
> > >
> > > Foo2:=function(a)
> > >     Print(a,"\n");
> > > end;
> > >
> > > Foo1();
> > > -------------------------------------------
> > >
> > > Syntax error: warning: unbound global variable in temp.gi line 6
> > >     Foo2(g);
> > >         ^
> > >
> > > I'm running GAP 4.5.5. Actually I have a bigger program that gives me
> > > various unbound global variable errors, but I've stripped it down to
> this,
> > > and still have the error. Any idea why?
> > >
> > > Ha T. Lam
> > >
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