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....omit.data.frame(list(obs = c(0.414153096303487, 1.39649463342491, : subscript out of bounds* Which I understand to mean that the bounds of the indicated vector/matrix have been violated. I am however at a loss as to how to resolve this. Any advice would be appreciated Cheers! JR -- Jonathan Richar Doctoral candidate UAF SFOS Fisheries Division 17101 Pt. Lena Loop Rd. University of Alaska Fairbanks Juneau, AK 99801 Phone: (907) 796-5459 [[alternative HTML version deleted]]

...k2=0.5)), + data=C1.lsoda, + start=list(K1=0.3, k2=0.7), + trace=T + ) Error in eval(as.name(varName), data) : Object "C1.lsoda" not found What part of the e-mail did I miss? I would like to get this problem up an running. Now, I am including Richar Upton's 2 cm model implementation and Christoffer Tornoe's nls solution (I recommend Christoffer's nlmeODE package for these problems also if multi-response data is available) The code follows: -------------------------------------------------------------- # Simulation of a 2 compartmen...