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2002 Sep 10
0
Error messages of nlme
...month 06
day 17
language R
The non-linear function:
mu2 <- function(k, A, B0, t) {
c0 <- exp(B0)
i <- exp(k)
c1 <- exp(A)
c0 * exp(-i*t) + c1/i * (1-exp(-i*t))
}
For example this error message:
> m2e.1 <- nlme(y ~ mu2(k, A, B0, t), data=thelp,
+ fixed = list(k + A + B0 ~ 1),
+ random = list(id = B0 ~ 1, f = B0 ~ 1),
+ start=c(k=-1.7, A=0.86, B0=1.44))
Error: Singularity in backsolve at level 0, block 1
or:
> m2e.15 <- update(m2e.13, corr = corExp())
Error in as.vector(dist(1:length(x))) : couldn't find function "dist&q...