Okay. Here is what will work.
The package loading mechanism has changed so my quick hack
to create a package from Maagard et al's files will not work
now. I'll try to fix it eventually when I have time...
1. Download and extract Maagard's tarball anywhere, say to
/Users/me/gapfiles/braid
(so /Users/me/gapfiles/braid/assemble.g is a file on your machine).
2. Edit all lines in assemble of the form
Read("blahblah");
to say
Read("/Users/me/gapfiles/braid/blahblah");
3. Start GAP in sage by sage -gap. The following should work:
gap> Read("/Users/wdj/computer_algebra/gapfiles/braid_dir2/assemble.g");
gap> g:=SymmetricGroup(3);;
gap> t:=[(1,2), (1,2)];;
gap> Braid(g,t);
Thu Nov 5 16:16:38 EST 2009
Collecting 20 random tuples... done
Cleaning done; 20 random tuples remaining
Orbit 1:
Length=1
Generated subgroup size=2
Centralizer size=2
Remaining portion of structure constant=0
Cleaning current orbit... done; 0 random tuples remaining
Thu Nov 5 16:16:38 EST 2009
Summary: orbits of generating tuples
Note/Question: gap_console() does not work, *I think* because
it does not start GAP using the -A flag. Does this make sense to
anyone? Is there a way to add an option to gap_console so that
GAP can be started in Sage using any of the available GAP flags?
On Wed, Nov 4, 2009 at 10:27 PM, Adam Sorkin <azsor...@hotmail.com> wrote:
>
> I am trying to load a Gap package for braid orbit computations. I
> would like to run everything through Sage if possible. This is an
> undeposited Implementation, so running "sage -i gap_packages-4.4.10_4
> " doesn't retrieve this package. I'm running this on OSX, 10.5, and
> have gap_version() = 4.4.10. I've downloaded and unzipped the package.
> I've tried the instructions:
>
>
> in sage, in gap_console()
> Read("assemble.g");
>
>
> and get the message
>
> "Error, file must exist and be readable called from <function>
> ( <arguments> ) called from read-eval-loop
> Entering break read-eval-print loop ..."
>
> Any suggestions?
>
> Adam
>
> >
>
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