memoize factorial example (was Re: decorators ?)
Tim Peters
tim.peters at gmail.com
Wed Dec 8 03:51:24 CET 2004
[Daniel 'Dang' Griffith]
>> But the factorial example on the wiki has a defect. It incorrectly
>> calculates factorial(0) as 0, when it should be 1.
[Terry Reedy]
> This is a matter of definition, and definitions apparently differ.
> fact(0) == 0 is a backward projection from the definition f(1) = f(2)
> = 1 in 1-based systems, which is the context for the rabbit
> problem in which the first year is year 1, not year 0.
> Disagreement is not defect.
Terry, since you're talking about "the rabbit problem", are you sure
you're talking about the factorial example? It sounds like you're
talking about the Fibonacci example. I agree with Daniel about the
factorial function: there's no disagreement about 0!=1, 1!=1, 2!=2,
3!=6, 4!=24, ..., that I've ever seen. The first two terms in a
Fibonacci sequence are indeed arbitrary, though.
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