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MathGroup Archive 1997

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Re: Integrate got slower in Version 3.0/Example

  • To: mathgroup at smc.vnet.net
  • Subject: [mg9006] Re: Integrate got slower in Version 3.0/Example
  • From: carlos at mars.Colorado.EDU (Carlos A. Felippa)
  • Date: Tue, 7 Oct 1997 03:35:55 -0400
  • Organization: University of Colorado, Boulder
  • Sender: owner-wri-mathgroup at wolfram.com

In article <616vj5$op0 at smc.vnet.net> Elias Saab <mathes at math.missouri.edu> writes:
>
>In version 2.2
>
>In[1]:= Integrate[Sqrt[R^2-x^2-y^2],{x,-R,R},
>        {y,-Sqrt[R^2-x^2],Sqrt[R^2-x^2]}]//Timing        
>
>
>                            3
>                      2 Pi R
>Out[1]= {5.17 Second, -------}
>                         3
>
>In Version 3.0
>Integrate[Sqrt[R^2-x^2-y^2],{x,-R,R},
>	{y,-Sqrt[R^2-x^2],Sqrt[R^2-x^2]}]//Timing
>Integrate::"gener": "Unable to check convergence"
>
>
>                           3   
>                      2 Pi R
>Out[1]= {32.8 Second, -------}
>                         3
>
>I mentionned this to Wolfram before the release of 3.0. It seems
>that nothing has been done to correct this.
>
>Elias Saab
>
>

 I noticed that too on my Mac versions.  For the above integrals:

 Mma 2.2: 4.7667 Seconds

 Mma 3.0: 22.416 Seconds

 For Simplify[], I have observed ratios of up to 20:1.  All operations
 I have timed so far are slower.  Perhaps the Mac kernel has not been
 properly optimized.  Mma 3.0 on a NT HP 200MHz Pentium seems noticeably
 faster although the front-end is buggier.

 What machine and OS were used in those tests?




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