Updates:
Summary: Product() is seriously broken
Cc: [email protected]
Labels: -Priority-Medium Priority-High
Comment #1 on issue 2639 by asmeurer: Product() is seriously broken
http://code.google.com/p/sympy/issues/detail?id=2639
Actually, Product is seriously broken.
- It should be unevaluated by default (as I said above).
- Product(f(n), n, 1, k) syntax is allowed, and, furthermore, it does
something different than Product(f(n), (n, 1, k))! (the former returns an
unevaluated product and the latter raises NotImplementedError)
- Product() tries to evaluate, but using a different algorithm than
product()!
- Product(f(n), (n, 1, k)) prints as Product(f(n), n, 1, k)
This class (except for the algorithms) probably needs to be completely
rewritten, so that it's more like Sum(), or Integral (the latter I know for
a fact is well used and has a good design). There was also some talk at
some point of unifying some of the common logic behind the three.
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