On Feb 22, 8:47 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> On Fri, Feb 22, 2008 at 12:50 AM, Simon King
>
>
>
> <[EMAIL PROTECTED]> wrote:
>
> > Dear William,
>
> > On Feb 22, 1:58 am, "William Stein" <[EMAIL PROTECTED]> wrote:
> > > > If I rename it to tensor.sage (not sure if this is a good idea),
>
> > > Yes, that's a VERY GOOD idea. It's really crazy to use a compiled
> > > spyx for the purposes of interfacing with the Singular interpreter
> > > via pexpect.
>
> > Sorry, using a compiled spyx was just, well, let's call it my personal
> > tradition.
>
> > Am i right that the loop must be re-written if it is .sage rather
> > than .spyx?
> > I think
>
> > for i from 1<=i<=len(L[2]):
> > is only possible in .spyx, while in .sage it should be
> > for i in range(1,len(L[2])+1)
>
> Yes, that is correct. But when you're not working with pure C data
> structures
> you're going to get no speed improvements by using
>
> > for i from 1<=i<=len(L[2]):
> instead of
> > for i in range(1,len(L[2])+1)
>
> You're just making things a little more difficult.
>
> > @John, this would explain the new error message after renaming the
> > file.
>
> Yes, that would.
>
>
>
> > However, i don't know why attaching the .spyx didn't work.
>
> That's very suspicious:
>
> "sage: attach tensorpower.spyx
> Loading of file "/Users/palmieri/.sage/tensorpower.spy" has type not
> implemented."
>
> That suggests there is either a very very weird serious bug that got
> magically fixed
> or maybe the above log isn't what really happened -- notice that in
> the error message
> it says .spy not .spyx.
Right, I'm confused by that, too, but that's what it says. I just
took the new file tensorpower.sage that Simon sent me, copied it to
tp.spyx, and did the following (in a new worksheet).
sage: attach tp.spyx
Loading of file "/home/palmieri/.sage/tp.spy" has type not
implemented.
sage: attach tensorpower.sage
sage: R=singular.ring(2,'(x1,x12,x2)','dp')
sage: D=singular.matrix(3,3,'0,0,-x12, 0,0,0, 0,0,0')
sage: S=singular.nc_algebra(1,D)
sage: S
// characteristic : 2
// number of vars : 3
// block 1 : ordering dp
// : names x1 x12 x2
// block 2 : ordering C
// noncommutative relations: ...
This is with Sage 2.9.3 on the linux box in my office, and I had a
similar problem with Sage 2.10.1 on my mac at home.
...
Now, after trying one or two more things, here's more information: if
I start sage from a terminal, then type "attach tp.spyx", I get an
error about not being able to find the file (which makes sense, since
I put the file in ~/.sage/, not in my home directory). Then I type
"notebook()", go to my web browser, and do the stuff I pasted in
above. Then I quit that, go back to the terminal, hit ctrl-C twice,
and do "attach tp.spyx". This time it works: typing "notebook()" and
then quitting it seems to change my default directory from ~/ to
~/.sage/.
So, anyway, it seems that I can attach .spyx files from the terminal
session, but not from a notebook in a web browser.
John
> -- William
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