> @Martin Albrecht:
> - Is there a reasonable way to fix this in the interface?
Hi, the 'trivial' way to fix it, is to implement a Python function for
SinguleElement called invariant_ring which calls the Singular function,
parses the output and returns a tuple. If you call A.invariant_ring the
Singular function is only called directly if there is no Python function with
the same name.
A better - and I guess doable - approach is to track down why it fails and fix
it.
> - If not: What could we do on the side of Singular to make the return
> of a tuple (like return(P,S,IS)) comprehensible for the interface? I
> guess "return(list(P,S,IS))" would work, but i'm not sure if this
> change of syntax wouldn't have nasty consequences for existing
> applications.
>
> There is a very clumsy way to pull the output of invariant_ring into
> sage:
> First, define A and R as above. Then say
> singular.eval('matrix P,S,IS=invariant_ring(%s)'%(A.name()))
> P=singular('P')
> S=singular('S')
> IS=singular('IS')
>
> But definitely i do think the correct syntax should be
> P,S,IS=A.invariant_ring()
and this is definitely possible either by doing what you are doing above
within a Python wrapper function or by fixing that issue.
> Now, another question on the Singular interface:
> In Singular, doing
> matrix P,S,IS = invariant_ring(A,1);
> would make Singular to additionally print information about the
> progress of computations (which, in big examples, might be nice to
> have).
>
> However, when i use the Singular interface, i can not see such
> informations. Where are they gone?
The information is printed but ignored because pexpect expects
Singular 'output' and ignores the rest. I am no pexpect expert so I don't
know how to fix it. It would very very useful though. Anyone else has any
idea?
Martin
--
name: Martin Albrecht
_pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99
_www: http://www.informatik.uni-bremen.de/~malb
_jab: [EMAIL PROTECTED]
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