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Topic: Trying to recursively define a double factorial
Replies: 6   Last Post: May 17, 2012 4:14 AM

 Messages: [ Previous | Next ]
 DrMajorBob Posts: 1,448 Registered: 11/3/08
Re: Trying to recursively define a double factorial
Posted: May 17, 2012 4:14 AM

You don't need to do it at all, since Mathematica already has Factorial2
built in.

Bobby

On Wed, 16 May 2012 03:20:52 -0500, Jorge Cantu <monsterbone@msn.com>
wrote:

> My goal here is to define a recursive function for a double factorial.
> The domain of this function is the set of positive integers. For a
> positive even integer n the value DF[n] is the product of all positive
> even integers which are <n. For a positive odd integer n the value
> DF[n] is the product of all positive odd integers which are <n.
>
> I wanna make a recursive function of this double factorial without
> If(and other similar statements). Here is my work so far:
>
>
> Clear[MyF1, n];
> MyF1[1] = 1;
> MyF1[n_Integer] /; (n > 0) := MyF1[n] = n*MyF1[n - 1]
>
> Table[MyF1[k], {k, (*integer*), (*integer*)}]
>
>
>
> How do I do this?
>

--
DrMajorBob@yahoo.com

Date Subject Author
5/17/12 James Stein
5/17/12 Dana DeLouis
5/17/12 Murray Eisenberg
5/17/12 Bob Hanlon
5/17/12 Tomas Garza Hernandez
5/17/12 DrMajorBob