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Re: Integration Problem

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126359] Re: Integration Problem
  • From: "Dave Snead" <dsnead6 at charter.net>
  • Date: Thu, 3 May 2012 22:23:08 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201205030834.EAA29972@smc.vnet.net>

Michael,

The 1/10 in the 1st expression enables an exact evaluation,
while the 0.1 in the 2nd expression forces a numerical evaluation.
Avoid floating point numbers with  decimal points if you want an exact 
answer.

Cheers,
Dave Snead

-----Original Message----- 
From: Michael Musheghian
Sent: Thursday, May 03, 2012 1:34 AM
To: mathgroup at smc.vnet.net
Subject: [mg126359] Integration Problem

Greetings!

I found that evaluation of this 2 integrals yield a bit different result. 
What could be the reason?

Integrate[E^(-1/10 ((1 + r2z)^2)), {r2z, -Infinity, Infinity}]

Integrate[E^(-0.1 ((1 + r2z)^2)), {r2z, -Infinity, Infinity}]





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