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Student Support Forum: 'FullSimplify: Mathematica 9 vs. Mathematica 8' topicStudent Support Forum > General > "FullSimplify: Mathematica 9 vs. Mathematica 8"

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xenos1984
01/03/13 5:24pm

In Response To 'Re: Re: Re: FullSimplify: Mathematica 9 vs. Mat...'
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It took me a while of experimenting to create some test case, until I came up with this example command (also in the attached notebook):

Table[Timing[FullSimplify[FunctionExpand[Sum[SphericalBesselJ[n + i, x] x^i, {i, -m, m}]]]][[1]], {m, 0, 5}]

You can also increase the table size if you wish to run some more iterations. If I use a freshly started session, M8 needs ~ 6 seconds for the final table entry, while M9 needs ~ 20 seconds for the same entry on my laptop (Intel Corei7, 4GB 1067MHz DDR, Ubuntu 12.04).

The effect is not as large as with my original example, but it should be a lot easier to reproduce. Unfortunately all my "real life" cases are rather complicated to reproduce and of similar type as the original attachment...

Attachment: Example.nb, URL: ,

Subject (listing for 'FullSimplify: Mathematica 9 vs. Mathematica 8')
Author Date Posted
FullSimplify: Mathematica 9 vs. Mathematica 8 xenos1984 12/31/12 07:27am
Re: FullSimplify: Mathematica 9 vs. Mathematica 8 Steve Keeley 12/31/12 3:57pm
Re: Re: FullSimplify: Mathematica 9 vs. Mathema... xenos1984 12/31/12 4:26pm
Re: Re: Re: FullSimplify: Mathematica 9 vs. Mat... jf 01/01/13 5:42pm
Re: Re: Re: Re: FullSimplify: Mathematica 9 vs.... xenos1984 01/03/13 5:24pm
Re: Re: Re: Re: Re: FullSimplify: Mathematica 9... Steve Keeley 01/05/13 6:16pm
Re: Re: Re: Re: Re: Re: FullSimplify: Mathemati... xenos1984 01/07/13 5:03pm
Another "long M9 calculation time" test case xenos1984 01/08/13 06:47am
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