dear ondrej,
thanks for the quick reply!
well, it is in the good direction. Indeed I would need to get rid of
the funcion call parenthesis, even if that is not pythonic. I actually
thought that _ could be a singleton object which, when its __add__,
__mul__, ... are called, returns a subclass of Add, Mul, ... with a
new unique symbol.
f = _ + 10
f._args --> ('__tmp42345', 10)
f2 = f + 5
f2._args --> ('__tmp42345', 15)
f2(3) --> 18
any ideas?
On Apr 1, 3:31 pm, "Ondrej Certik" <[EMAIL PROTECTED]> wrote:
> On Tue, Apr 1, 2008 at 2:59 PM, atir ajnopse <[EMAIL PROTECTED]> wrote:
>
> > Hi.
>
> > I'm new to this list and was interested in sympy to use it to help
> > implement a DSL for audio synthesis.
>
> > I had a question: I would like to have a symbol, say "_" --without the
> > quotation marks ;-) , which creates unique copies of itself so that
> > the following is possible:
>
> > f = _ + _ -> would behave as f = x + y (given x and y are Symbols),
> > a bit like it is used in many functional languages (and not like 2 *
> > _ )
>
> > It should also be possible to then substitute each symbol with a value
> > or with another symbol individually.
>
> Yep, that is easy, just append this at the end of my script above:
>
> print f.subs(Symbol("b"), 5)
On Apr 1, 3:31 pm, "Ondrej Certik" <[EMAIL PROTECTED]> wrote:
> On Tue, Apr 1, 2008 at 2:59 PM, atir ajnopse <[EMAIL PROTECTED]> wrote:
>
> > Hi.
>
> > I'm new to this list and was interested in sympy to use it to help
> > implement a DSL for audio synthesis.
>
> > I had a question: I would like to have a symbol, say "_" --without the
> > quotation marks ;-) , which creates unique copies of itself so that
> > the following is possible:
>
> > f = _ + _ -> would behave as f = x + y (given x and y are Symbols),
> > a bit like it is used in many functional languages (and not like 2 *
> > _ )
>
> > It should also be possible to then substitute each symbol with a value
> > or with another symbol individually.
>
> Yep, that is easy, just append this at the end of my script above:
>
> print f.subs(Symbol("b"), 5)
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