R Under development (unstable) (2024-06-05 r86695 ucrt) -- "Unsuffered Consequences"
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> ## test for PR#9765
> library(nlme)
> Orth <- subset(Orthodont, Subject %in% c("M01","F01"))
> # Argument fixed in varIdent is ignored
> vf  <- varIdent(form=~1|Sex,fixed=c(Female=0.5))
> vf <- Initialize(vf, data=Orth)
> stopifnot(varWeights(vf) == rep(c(1,2), each=4))
> 
> proc.time()
   user  system elapsed 
   0.14    0.06    0.18