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MathGroup Archive 1997

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Restrict computations to Reals

  • To: mathgroup at smc.vnet.net
  • Subject: [mg5882] Restrict computations to Reals
  • From: sasrbk at unx.sas.com (Bart Killam)
  • Date: Sun, 2 Feb 1997 01:32:04 -0500
  • Organization: SAS Institute Inc.
  • Sender: owner-wri-mathgroup at wolfram.com


 I am evaluating the normal integral with general
parameters mu and sigma:

  Integrate[(1/Sqrt[2Pi])]Exp[(x-mu)/(2sigma^2)],{-Infinity,Infinity}]

 One of the answers is correct:  Sqrt[sigma^2]/sigma,
the general answer is left in integral form because
Mathematica assumes sigma is a complex number. 

 How do I tell Mathematica that I am only considering cases where
mu and sigma are reals, so the general case is skipped, and
the correct answer is reduced to 1 ?

 Thanks for any help.

-- 
Bart Killam                            Work:  919-677-8000 x7538
SAS Institute Inc.                     Fax:   919-677-8224
SAS Campus Dr., R5215                  Email: sasrbk at unx.sas.com
Cary NC 27513-8000   



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