Mathematica 9 is now available
Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
2003
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 2003

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Help to solve numerical equation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg43753] Re: Help to solve numerical equation
  • From: poujadej at yahoo.fr (Jean-Claude Poujade)
  • Date: Fri, 3 Oct 2003 02:28:42 -0400 (EDT)
  • References: <blcqh2$p75$1@smc.vnet.net> <blgiif$feh$1@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

bobhanlon at aol.com (Bob Hanlon) wrote in message news:<blgiif$feh$1 at smc.vnet.net>...
> NSolve is used primarily with polynomial equations.  Use FindRoot.
> 
> eq=0.5*Exp[x*200]+0.21*Exp[x*500]+
>       0.1*Exp[x*110]+0.07*Exp[x*(15)]+
>       0.018*Exp[x*(-16)]+0.002*Exp[x*(-263)]-1;
> 
> FindRoot[eq==0,{x,.0004}]
> 
> {x -> 0.00042907}
> 
> 
> Bob Hanlon

Right! But FindRoot doesn't "see" there's another root...

---
jcp


  • Prev by Date: Re: A question on interval arithmetic
  • Next by Date: Re: Functions with initial values
  • Previous by thread: Re: Help to solve numerical equation
  • Next by thread: RE: Re: Help to solve numerical equation