Re: bug???
- To: mathgroup at smc.vnet.net
- Subject: [mg45241] Re: bug???
- From: gtsavdar at auth.gr (George)
- Date: Tue, 23 Dec 2003 05:13:33 -0500 (EST)
- References: <bs3nhd$io4$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
"ANDY" <wangzhengyao at hotmail.com> wrote in message news:<bs3nhd$io4$1 at smc.vnet.net>... > hello, > > please running the next Expression: > > Timing[NSolve[x^802 + 4x^403 + 2x^2 - 3 == 0, x, 4]] > > in Mathematica4.1 and Mathematica 5. > > Why??? I've tried to run : Timing[NSolve[x^802 + 4x^403 + 2x^2 - 3 == 0, x, 4]] but after 5 minutes no result found so i stopped it. What are your times on Mathematica 5.0 and 4.1? Then i run these: ------------------------------------------------------ Mathematica 5.0 Timing[NSolve[x^80 + 4x^40 + 2x^2 - 3 == 0, x, 4]] Time= 0.83 s Timing[NSolve[x^180 + 4x^40 + 2x^2 - 3 == 0, x, 4]] Time= 13.67 s Timing[NSolve[x^50 + 4x^50 + 2x^2 - 3 == 0, x, 4]] Time= 0.22 s ------------------------------------------------------ Mathematica 4.2 Timing[NSolve[x^80 + 4x^40 + 2x^2 - 3 == 0, x, 4]] Time= 0.11 s Timing[NSolve[x^180 + 4x^40 + 2x^2 - 3 == 0, x, 4]] Time= 0.49 s Timing[NSolve[x^50 + 4x^50 + 2x^2 - 3 == 0, x, 4]] Time= 0.05 s ------------------------------------------------------ First case : Mathematica 5.0 is 7.5 times slower than Mathematica 4.2. Second case: Mathematica 5.0 is 27.9 times slower than Mathematica 4.2. Third case : Mathematica 5.0 is 4.4 times slower than Mathematica 4.2. So Mathematica 5.0 seems to be slower from Mathematica 4.2 in this kind of operations. All these from a PIV-1800 MHz of my university computers.