Services & Resources / Wolfram Forums
MathGroup Archive
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2006

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Binomial Distribution

  • To: mathgroup at
  • Subject: [mg71370] Re: [mg71356] Binomial Distribution
  • From: Daniel Lichtblau <danl at>
  • Date: Thu, 16 Nov 2006 00:52:51 -0500 (EST)
  • References: <>

Bruce Colletti wrote:
> Re Mathematica 5.2 under WinXP.
> Why doesn't the code below return a rational number?  
> X = BinomialDistribution[10, 6/10];
> F[x_] := CDF[X, x];
> Rationalize@F@4
> Thankx.
> Bruce

The direct question is how to find the rational value of 
BetaRegularized[2/5,6,5]. Rationalize works on explicitly approximate 
numbers, not on symbolic forms that happen to be rational. 
FunctionExpand will convert BetaRegularized[2/5,6,5] to 1623424/9765625.

Daniel Lichtblau
Wolfram Research

  • Prev by Date: Re: (Mathematica wish list)
  • Next by Date: Re: transcendental equation
  • Previous by thread: Binomial Distribution
  • Next by thread: Re: Binomial Distribution