Emergent Help: NSolve Problems!

*To*: mathgroup at smc.vnet.net*Subject*: [mg39753] Emergent Help: NSolve Problems!*From*: Chengzhou Wang <wcz at ece.ucsd.edu>*Date*: Thu, 6 Mar 2003 02:35:04 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

Hi, guys I have some complicated polynomials, and I want to calculate its roots. HOwever, when I use NSolve, it creates some problems. Say a simple example: temp[s_]=s^10+10 s^9+ 10 s^8 +10 s^7 +10 s^6+ 10 s^5 +10 s^4 +1; NSolve[temp[s]==0, s] It will give: Out[4]= {{s -> -8.99998}, {s -> -1.06539}, {s -> -0.468828 - 0.886239 I}, > {s -> -0.468828 + 0.886239 I}, {s -> -0.409684 - 0.469948 I}, > {s -> -0.409684 + 0.469948 I}, {s -> 0.401048 - 0.312597 I}, > {s -> 0.401048 + 0.312597 I}, {s -> 0.51015 - 0.878693 I}, > {s -> 0.51015 + 0.878693 I}} But when I plug in the first number, which is "-8.99998", it should give a value close to zero. However, it gives: In[5]:= temp[-8.99998] Out[5]= -411.473 The other roots seems OK. Does anyone know why? This is just a simple example. I have some more complicated polynomials to deal with. Thanks in advance! PS: Please reply (cc) to my email. I did not subscribe my email to the this email group! -- Chengzhou

**Follow-Ups**:**Re: Emergent Help: NSolve Problems!***From:*Daniel Lichtblau <danl@wolfram.com>

**Re: Emergent Help: NSolve Problems!***From:*Dr Bob <drbob@bigfoot.com>