On 11/6/07, Simon King <[EMAIL PROTECTED]> wrote:
> Dear sage-supporters,
>
> assume that i have defined some Singular object (say, via
> singular.eval), and later i want to produce a Sage object that refers
> to it. I tried:
> sage: singular.eval('ring r = 0,(x,y,z),dp')
> ''
> sage: R=singular('r')
>
> But unfortunately R does not refer to r but to a copy of r, as the
> following shows:
> sage: R.name()
> 'sage5'
>
> How can i make R directly point to r?
Unfortunately, this is not implemented. Implementing it would require
changing SAGE_ROOT/devel/sage/sage/interfaces/singular.py, in some
slightly nontrivial ways -- in particular the __init__ method of
SingularElement would have to be changed, etc.
You can accomplish the same thing as follows, by simply changing the
._name attribute (and being sure to kill the sage5 _name that is
generated, to avoid a memory leak):
sage: singular.eval('ring r = 0,(x,y,z),dp')
''
sage: R = singular('r')
sage: singular.clear(R.name())
sage: R._name = 'r'
sage: R
// characteristic : 0
// number of vars : 3
// block 1 : ordering dp
// : names x y z
// block 2 : ordering C
However, if your goal is maximizing speed, then doing the above
would be silly.
William
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