[R] non-linear fourth-order differential equations

[Ravi Varadhan]

OP is asking about a system of fourth-order "differential" equations,
whereas you are telling her how to solve a single, algebraic nonlinear
equation.

Take a look at package "deSolve", and the function `lsode' in that package
for solving a system of nonlinear ODEs (given initial values).

Ravi.

-------------------------------------------------------
Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology School of Medicine Johns
Hopkins University

Ph. (410) 502-2619
email: rvaradhan at jhmi.edu

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Wu Gong
Sent: Sunday, November 28, 2010 6:31 PM
To: r-help at r-project.org
Subject: Re: [R] non-linear fourth-order differential equations


Hi Yanika,

Please try ?uniroot and ?ployroot

f <- function(x) x^4-16
uniroot(f, lower= -3, upper=0)
polyroot(c(-16,0,0,0,1))

-----
A R learner.
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