Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2005
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*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

Version differences in Integrate with Min[] in the integrand

  • To: mathgroup at smc.vnet.net
  • Subject: [mg55858] Version differences in Integrate with Min[] in the integrand
  • From: Gareth Russell <gjr2008 at columbia.edu>
  • Date: Fri, 8 Apr 2005 01:36:30 -0400 (EDT)
  • Organization: Columbia University
  • Sender: owner-wri-mathgroup at wolfram.com

Hi,

I don't think this is a function of differences in the internal use of 
Simplify. Anyone have an idea about what is going on here?

Gareth Russell
Columbia University


Integrate[Exp[-r*(Min[d2,t1]-Min[
        d1,t1])]/((d12-d11)*(d22-d21)),{d1,d11,d12},{d2,d21,d22}]

The result in v4.2

\!\(\(â?«\_d11\%d12\(â?«\_d21\%d22\( \[ExponentialE]\^\(\(-r\)\ \((\(-Min[d1, t1]\
\) + Min[d2, t1])\)\)\) \[DifferentialD]d2 \
\[DifferentialD]d1\)\)\/\(\((\(-d11\) + d12)\)\ \((\(-d21\) + d22)\)\)\)

The result in v5.0

\!\(\(\[ExponentialE]\^\(\(-d21\)\ r\)\ \((\(-\[ExponentialE]\^\(d11\ r\)\) - \
\[ExponentialE]\^\(d21\ r\) + \[ExponentialE]\^\(r\ \((d11 + d21 - t1)\)\) + \
\[ExponentialE]\^\(r\ t1\))\)\)\/\(\((d11 - d12)\)\ \((d21 - d22)\)\ r\^2\)\)

(Incorrect, I think...)

The result in v5.1.0

Nothing: runs for many minutes.


  • Prev by Date: Re: Y axis labelling on OS X. new (to me) development.
  • Next by Date: Getting mathlink started
  • Previous by thread: Re: Op-codes in CompiledFunction
  • Next by thread: Re: Version differences in Integrate with Min[] in the integrand