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Re: Re: Bug with Hypergeometric2F1?

• To: mathgroup at smc.vnet.net
• Subject: [mg99444] Re: [mg99422] Re: [mg99384] Bug with Hypergeometric2F1?
• From: Andrzej Kozlowski <akoz at mimuw.edu.pl>
• Date: Wed, 6 May 2009 05:20:46 -0400 (EDT)
• References: <200905050943.FAA20864@smc.vnet.net>

On 5 May 2009, at 18:43, Bob Hanlon wrote:

> Or change the function definition to force precision
>
> vol1[n_, k_] := Sum[Binomial[Rationalize[n, 0], i],
>  {i, 0, Rationalize[k, 0]}]
>
> vol1 @@@ {{1000, 1}, {1000, 1.}, {1000., 1}, {1000., 1.}}
>
> {1001,1001,1001,1001}
>
>
> Bob Hanlon

Actually, in this case (when you use SetDelayed instead of Set as in  
the original post) Rationalize is not needed:

  vol1[n_, k_] := Sum[Binomial[n, i], {i, 0, k}]

vol1 @@@ {{1000, 1}, {1000, 1.}, {1000., 1}, {1000., 1.}}
{1001, 1001, 1001., 1001.}

Andrzej Kozlowski

• References:
  • Re: Bug with Hypergeometric2F1?
    • From: Bob Hanlon <hanlonr@cox.net>