On Fri, 13 Nov 2009 11:50:10 +0100
Burcin Erocal <bur...@erocal.org> wrote:
>
> Hi Jason,
>
> On Thu, 12 Nov 2009 12:30:11 -0600
> Jason Grout <jason-s...@creativetrax.com> wrote:
>
> > It would be nice if we could do something like:
> >
> > sage: f(x,0)=e^x
> >
> > sage: f(x,t)=x*t
> >
> >
> > or
> >
> > sage: f(0)=0
> > sage: f(x)=sin(x)/x
> >
> > Is there an elegant way to have multiple definitions like this in
> > pynac, or definitions with specific conditions on the arguments?
>
> You can do this:
>
> sage: def eval_f(x):
> ....: if x.is_zero():
> ....: return 0
> ....: return sin(x)/x
> ....:
> sage: f = function('f',nargs=1, eval_func=eval_f)
> sage: f(0)
> 0
> sage: f(x)
> sin(x)/x
>
>
> I like the fact that the conditions and comparison order is explicit.
You can also use this
http://peak.telecommunity.com/DevCenter/RulesReadme
to define the evaf_f() above. I still prefer being explicit though.
Cheers,
Burcin
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