On 26/08/2008, at 2:12 PM, William Stein wrote:
>> I actually don't understand this. For both pynac and the existing
>> maxima link, I think you must already have some method of
>> transforming
>> a python object to and from lisp-like expressions.
>
> Pynac works with objects that are simply expression trees constructed
> directly from native Python objects. Literally, if you type, e.g.,
>
> sage: S = var('x',ns=1).parent() # new symbolic ring
> sage: foo = S(any_crazy_element_you_can_think_of_in_Sage)^3 + 17
>
> then Pynac constructs an expression tree with a *pointer* in memory
> to that any_crazy_element_you_can_think_of_in_Sage. This pointer
> setting takes a few nanoseconds.
If shared memory is important to you then lisp won't do. Fair.
> Moreover, because of the extreme
> flexibility of any_crazy_element_you_can_think_of_in_Sage, you
> can do awesome things from this point of view, which are impossible
> in maxima via Sage.
Cool. I will try to have a play with ginac and the combination and
see if I can bend it to my Mathematica-will.
D
==================================
David J Philp
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