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From: olfa on 29 Mar 2010 08:19
Hello Mathematica Community
I've made a strange observation when using Mathematica 7 and
Mathematica 5.1. I thought that Mathematica 7 is more performant than
Mathematica 5.1 but when trying to solve the same system of equations
and inequalities by the function Reduce[] , Mathematica 7 has spent
4794.03 seconds whereas Mathematica 5.1 has spent 2.437 seconds.
how to explain that?
is the function Timing the same one for the two Mathematica versions?

Many thanks

From: Vince Virgilio on 30 Mar 2010 06:03
On Mar 29, 8:19 am, olfa <olfa.mra...(a)yahoo.fr> wrote:
> Hello Mathematica Community
> I've made a strange observation when using Mathematica 7 and
> Mathematica 5.1. I thought that Mathematica 7 is more performant than
> Mathematica 5.1 but when trying to solve the same system of equations
> and inequalities by the function Reduce[] , Mathematica 7 has spent
> 4794.03 seconds whereas Mathematica 5.1 has spent 2.437 seconds.
> how to explain that?
> is the function Timing the same one for the two Mathematica versions?
>
> Many thanks

Without more detail, I can only guess. Possibly Mathematica's 7
computation was sent to a subkernel, below the radar of Timing[].

Vince Virgilio

From: Nicola Mingotti on 1 Apr 2010 06:58
On 2010-03-29 14:19:43 +0200, olfa said:

> Hello Mathematica Community
> I've made a strange observation when using Mathematica 7 and
> Mathematica 5.1. I thought that Mathematica 7 is more performant than
> Mathematica 5.1 but when trying to solve the same system of equations
> and inequalities by the function Reduce[] , Mathematica 7 has spent
> 4794.03 seconds whereas Mathematica 5.1 has spent 2.437 seconds.
> how to explain that?
> is the function Timing the same one for the two Mathematica versions?
>
> Many thanks

But really, besides what Timing says, Mathematica 7 is using a couple
of seconds or more than an hour to solve it ?

bye

Nicola

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