Ben Bolker wrote:

[snip snip snip snip]


How about "strict" option that could be set to disallow use of T/F variables?

   I had a student run into trouble fairly recently (although can't
at the moment provide a reproducible example using T as a
variable in a formula that was passed to nls() ... I think there
might still be some internal use of T/F in that package ...


Probably because T is defined in Namespace base

 T <- 0
 getFromNamespace("T", "base") # [1] TRUE

Uwe




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