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2010 Apr 06
1
estimating the starting value within a ODE using nls and lsoda
...n ODE model.
That is, in the typical combined fitting procedure using nls and lsoda (alternatively rk4), I first defined the ODE model:
minmod <- function(t, y, parms) {
G <- y[1]
X <- y[2]
with(as.list(parms),{
I_t <- approx(time, I.input, t)$y
dG <- -1*(p1 + X)*G +p1*G_b
dX <- -1*p2*X + p3*(I_t-I_b)
list(c(dG, dX))
})
}
Then I estimated the parameters of the model using nls:
fit.rk4 <- nls(noisy ~ rk4(p4, time, minmod, parms=c(p1,p2,p3))
However, my goal is to not only estimate p1, p2 and p3, but also to estimate the starting value p4 from the da...
2009 Jul 23
1
[PATCH server] changes required for fedora rawhide inclusion.
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