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MathGroup Archive 2007

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Re: FactorInteger slow in V6.0 vs V5.2

  • To: mathgroup at smc.vnet.net
  • Subject: [mg81162] Re: [mg81116] FactorInteger slow in V6.0 vs V5.2
  • From: Syd Geraghty <sydgeraghty at mac.com>
  • Date: Fri, 14 Sep 2007 03:39:05 -0400 (EDT)
  • References: <200709131022.GAA15647@smc.vnet.net>

Mark,

Results for my machine are below.

$Version -> "6.0 for Mac OS X x86 (32-bit) (June 19, 2007)"
MacBookPro2,1.   Intel Core 2 Duo, 2.33 GHz

Timing[FactorInteger[2^227 - 1]]

{984.557, {{26986333437777017,
    1}, {7992177738205979626491506950867720953545660121688631, 1}}}


Syd Geraghty




On Sep 13, 2007, at 3:22 AM, Mark Fisher wrote:

> In version 5.2 the following runs pretty fast (not more than a couple
> of minutes)
>
> FactorInteger[2^227-1]
>
> but quite slow in version 6.0 (I'm not sure how long). Any ideas as to
> why?
>
> --Mark
>
>



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