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2003 Nov 05
3
using LSODA in R
R help list subscribers,
I am a new user of R. I am attempting to use R to explore a set of
equations specifying the dynamics of a three trophic level food chain. I
have put together this code for the function that is to be evaluted by
LSODA. My equations Rprime, Cprime, and Pprime are meant to describe the
actual equation of the derivative. When I run LSODA, I do not get the
output that these equations should be giving. Can someone tell me if I have
set this function up correctly to use with LSODA when the user is specifying
the equation of the derivative...
2004 Jan 22
4
Fitting compartmental model with nls and lsoda?
...unction is very fussy about names for variables
# C[1] = C, meaning the first dependent variable ; Cd1 is its derivative wrt time
# C[2] = A2, meaning the second dependent variable ; Cd2 is its derivative wrt time
# You can change C to another name, but must keep these conventions
# The output from Cprime (its last line) must be a list of the derivative of C wrt time
# You must install the "odesolve" package in R. See the website for details.
# This example gave results similar (within 6 sig. fig.) to the same problem
# solved in an independent differential equation solving package.
#...