Message-ID: <Pine.A41.4.44.0208301444590.226828-100000@homer03.u.washington.edu>
Date: 2002-08-30T21:45:22Z
From: Thomas Lumley
Subject: solving equations
In-Reply-To: <002f01c2506c$2c9a6080$39cffea9@batata>
On Fri, 30 Aug 2002, Antonio Olinto wrote:
> Dear R-users,
>
> I'm trying to solve the following equation:
>
> F=25*(F+0.2)/22.2/(EXP(F+0.2)-1)
>
> In Excel I found F=0.696176718 but I'd like to know how to use R to solve
> it. I tried, without success, to use "solve".
>
Use uniroot()
R> uniroot(function(F) F-25*(F+0.2)/22.2/(exp(F+0.2)-1), c(0,10))
$root
[1] 0.695973
$f.root
[1] -9.561183e-06
$iter
[1] 4
$estim.prec
[1] 6.103516e-05
-thomas
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