[R] gnls from library nlme

[Peter Schlattmann]

Dear all,

I am trying to gain some experience with the function gnls from the nlme
package.
I tried to model the Theophyline data by trying to model the presumed
dependency of
the clearance on the body weight.

This is my  function call of gnls:

gnls(conc~SSfol(Dose,Time,lKe,lKa,lCl),data=Theoph,
params=list(lKe~1,lKa~1,lCl~Wt),start=c(-2.4,0.46,-3.22,0.01))

That's been the result:

Error in as.vector(x, mode) : cannot coerce to vector

I tried various other calls with no success. Does anyone have a hint for
me?

Thanks a lot
Peter

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