Hi there,
> 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?
>
> This is one thing that is really nice about Mathematica: since things
> work by pattern-matching, you can define a function different ways based
> on all sorts of conditions on the inputs. Mathematica then uses the
> most general definition it can when trying to evaluate the function.
Unfortunately, f(...) = ... seems to be forbidden by the very syntax of
python. This is at least the third place where I see someone requesting to
remove this limitation. I don't know how at all how python guys are open but I
(and I'm sure I'm not the only one) would very much like to have be able to
write for an object <obj> of class <class>
obj(params) = value
which is dispatched to something
class.__setcall__(obj, (params), value)
otherwise said there is a symmetry
__getitem__ / __setitem__
__getslice__ / __setslice__
__getattr__ / __setattr__
I very much like to have a symmetry
__call__ = __getcall__ / __setcall__
How popular in sage people such a syntax would be ? Is there any chance if
requesting it to python to be heard ?
Once this is allowed, then implementing patter matching should be rather
easy.
Cheers,
Florent
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