On 7/27/07, David Joyner <[EMAIL PROTECTED]> wrote:
> On 7/27/07, mak <[EMAIL PROTECTED]> wrote:
> >
> > 1. What's the most elegant way of writing a matrix into a file in
> > pari-readable format? I can make it into a string, open a file, write
> > the string, close the file.
> > 2. How do I specify the directory where the file is saved? sage
> > seems to not understand the path like '~/desiredpath/
> > desireddirectory', so I have to back up '../' 5-6 times from sage's
> > default directory ('worksheets/_scratch_/cells/93/' or something like
> > that)
Here's an example that saves a SAGE matrix to a pari matrix
in the file ~/foo.gp:
{{{id=0|
m = random_matrix(QQ,5)
}}}
{{{id=1|
home = os.environ['HOME']
open(home + '/mat.gp', 'w').write(m._pari_init_())
}}}
{{{id=2|
%gp
\r /home/was/mat.gp
///
[2 2 -1 1/2 2]
[-2 0 0 -1/2 -1]
[0 -1 -1 1 -2]
[-2 1/2 1/2 -1 2]
[-1 2 0 0 0]
}}}
> >
>
>
> The file sage-env in sage*/local/bin shows that names such as
> SAGE_ROOT are known to SAGE, so you can use it to help some.
> You can also add any directory to that script that you want SAGE to know.
> I've never had a problem using absolute paths. Possibly I'm not understanding
> your question correctly?
>
>
> > I'm sorry to bother people with basic questions like this, but the
> > documentation is far too technical for the casual user, and not easily
> > searchable either.
> >
> > Thanks,
> > Mak
> >
> >
> > >
> >
>
> >
>
--
William Stein
Associate Professor of Mathematics
University of Washington
http://www.williamstein.org
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