Updates:
Labels: -smichr -NeedsReview
Comment #12 on issue 2639 by [email protected]: Product() is seriously broken
http://code.google.com/p/sympy/issues/detail?id=2639
The only thing remaining is to pattern Product after Sum in taking more
than one limit.
It doesn't autoevaluate (use product() or Product().doit())
>>> Product(x,(x,1,3))
Product(x, (x, 1, 3))
It prints properly
>>> Product(f(n), (n, 1, k))
Product(f(n), (n, 1, k))
It doesn't take mutiple products
>>> Product(f(n), (n, 1, k),(a,1,3))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\concrete\products.py", line 32, in __new__
raise NotImplementedError
NotImplementedError
The limit must be given as a tuple
>>> Product(f(n), n, 1, k)
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "sympy\concrete\products.py", line 32, in __new__
raise NotImplementedError
NotImplementedError
so we have
- sum and prod to act like Add and Mul on a list
- summation and product to do symbolic sums
- Sum and Product to do unevaluated symbolic sums and products
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