R Under development (unstable) (2023-07-03 r84633 ucrt) -- "Unsuffered Consequences"
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> ### nlmer() convergence testing / monitoring / ...
> ##  -------------------
> 
> ### The output of tests here are *not* 'diff'ed  (<==> no *.Rout.save file)
> library(lme4)
Loading required package: Matrix
> 
> ## 'Theoph' Data modeling
> 
> if (lme4:::testLevel() > 1) {
+     Th.start <- c(lKe=-2.5, lKa=0.5, lCl=-3)
+ 
+     (nm2 <- nlmer(conc ~ SSfol(Dose, Time,lKe, lKa, lCl) ~ lKe + lKa + lCl|Subject,
+                   Theoph, start = Th.start))
+     (nm3 <- nlmer(conc ~ SSfol(Dose, Time,lKe, lKa, lCl) ~ (lKe|Subject) +
+                                                            (lKa|Subject) + (lCl|Subject),
+                   Theoph, start = Th.start))
+     ## dropping   lKe  from random effects:
+     (nm4 <- nlmer(conc ~ SSfol(Dose, Time,lKe, lKa, lCl) ~ lKa + lCl|Subject,
+                   Theoph, start = Th.start,
+                   control = nlmerControl(tolPwrss=1e-8)))
+     (nm5 <- nlmer(conc ~ SSfol(Dose, Time,lKe, lKa, lCl) ~ (lKa|Subject) + (lCl|Subject),
+                   Theoph, start = Th.start))
+ }
> 
> proc.time()
   user  system elapsed 
   1.10    0.17    1.21