[Rd] variables in nls (PR#829)

[baron@cattell.psych.upenn.edu]

Full_Name: Jonathan Baron
Version: 1.2.1
OS: Linux
Submission from: (NULL) (151.197.202.231)


The following gives an error message:
> nls(doit[2,] ~ 7/(1 + exp(a*efft[2,])),start=c(a=-.1))
Error in as.name(varName) : attempt to use zero-length variable name

The following runs fine:
> nls(doit.vm ~ 7/(1 + exp(a*efft.vm)),start=c(a=-.1))

This happens even though doit.vm and doit[2,] are identical (and efft[])


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