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MathGroup Archive 2003

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  • To: mathgroup at
  • Subject: [mg44794] NIntegrate
  • From: Zheng Yang <zhengy at>
  • Date: Thu, 27 Nov 2003 11:38:18 -0500 (EST)
  • Organization: University of Pennsylvania
  • Sender: owner-wri-mathgroup at


I'd like to ask why the first expression below takes so much longer to finish than the second. They look same to me.

\!\(N[â?«\_1\%â??\((x - 1)\)^ .5\ \(1\/\(1 + Exp[\((x - 
          2)\)/2]\)\) \[DifferentialD]x]\)

\!\(NIntegrate[\((x - 1)\)^ .5\ 1\/\(1 + Exp[\((x - 2)\)/2]\), {x, 1, â??}]\)

And I'd like to know if this apply to other numerical functions.

Thanks a lot,


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