> Moreover, I think that something like this would be extremely useful as
> a function incorporated into the sympy distribution:
> >>> collect(expr2.subs([(a**(n+1), u*a**(n+1)) for a in _]), u)
Another approach would be to use Wild symbols when calling collect().
Like this:
>>> from sympy.tensor import Indexed
>>> M = Indexed('M')
>>> expr = x*M(k,m)**(n+1) + y*M(k,m)**(n+1) + M(k,m)**n + z*M(k,m)**n
>>> w = Wild('w1')
>>> collect(expr, w**(n+1))
M(k, m)**n + z*M(k, m)**n + (x + y)*M(k, m)**(1 + n)
>>> collect(expr, w**n)
(1 + z)*M(k, m)**n + x*M(k, m)**(1 + n) + y*M(k, m)**(1 + n)
However, this does not work. Does anyone know if there is a particular
reason for that, or is it a bug?
Øyvind
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