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 2005

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

Search the Archive

Mathematica 5.1 Cumulative Normal Definition

  • To: mathgroup at
  • Subject: [mg58043] Mathematica 5.1 Cumulative Normal Definition
  • From: "Frank M" <frankm60606 at>
  • Date: Thu, 16 Jun 2005 07:26:48 -0400 (EDT)
  • Reply-to: <frankm60606 at>
  • Sender: owner-wri-mathgroup at

(normalcdf[x_] := 1/2 Erf[x^2] + 1/2;
 ?[x_] := D[normalcdf[x1],x1] /. x1 -> x //

[ExponentialE]-(x^2/2)/Sqrt(2 ?)

I am using this definition of the Cumulative Normal Function which produces
a nice clean derivative. When I start using complicated functions the 1/2
from the definition makes for messy solutions. Can anyone suggest a better
way to define the cumulative normal distribution? I am only interested in
symbol derivatives of the distribution. Thanks.


  • Prev by Date: Re: Re: fitting multiple datasets
  • Next by Date: Re: For Loop and Array related
  • Previous by thread: Re: field line with NDSolve
  • Next by thread: Re: Mathematica 5.1 Cumulative Normal Definition