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?