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MathGroup Archive 2005

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Re: Slow simplify[], integrate[] in 5.2 for Mac

  • To: mathgroup at smc.vnet.net
  • Subject: [mg61756] Re: [mg61731] Slow simplify[], integrate[] in 5.2 for Mac
  • From: Chris Chiasson <chris.chiasson at gmail.com>
  • Date: Fri, 28 Oct 2005 03:25:40 -0400 (EDT)
  • References: <200510270902.FAA19497@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Speed was fixed in 5.2. It was a bug.

Actually, there is probably some assumption 4.2 made about the
integral that 5.2 doesn't make - 5.2 is supposed to be better at
handling integration, but this sometimes makes it slower. Daniel L
will probably say this much more eloquently.

On 10/27/05, Eran Mukamel <emukamel at stanford.edu> wrote:
> Hi All,
>
> I wonder if someone can give some insight into why some simple
> calculations are dramatically slower (or don't even simplify) in
> Mathematica 5.2 which run perfectly well in 4.2. I'm using a G5 Mac OSX
> 10.4.  In particular I find the following (artificial) integral:
>
> Timing[Integrate[(a+c-sdfd+34e)Exp[(a+4c-d+34e) x^2+(b-54c+4h) x+c],{
>         x,-Infinity,Infinity},Assumptions\[Rule](a+4c-d+34e)<0]]
>
> runs in 0.16 sec using 4.2, but >5 sec using 5.2.
>
> Thanks in advance!
>
> Eran Mukamel
>
> Stanford Physics
> emukamel at stanford.edu
>
>


--
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