I think that would be a useful abstraction. Similar to the Transform
object in sympy.core.rules.
Aaron Meurer
On Sun, Sep 22, 2013 at 11:59 AM, F. B. <franz.bona...@gmail.com> wrote:
> Aaron, what do you think if I try to write a PR introducing a matching map?
>
> For example, something behaving like
>
>>>> ri = MatcherMap()
>>>> x = symbols('x')
>>>> a = Wild('a', exclude=[x])
>>>> b = Wild('b', exclude=[y])
>>>> ri[a] = lambda a, x : a * x
>>>> ri[cos(a + b*x)] = lambda a, b, x : sin(a + b*x)/b
>>>> ri[cos(2)]
> cos(2)*x
>>>> ri[cos(2+3*x)]
> sin(2+x)/3
>
>>>> def f(a, x):
> ... if a != -1:
> ... return x**(a+1)/(a+1)
> ... else:
> ... return log(x)
>>>> ri[x**a] = f
>
> Writing it the unoptimized way wouldn't be that difficult.
>
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