[Rd] string-length limitations

[jake wilson]

Hi,

I'm attempting to "glm" a formula - something that's not caused problems in 
the past.  I've used formulas of the form

    formula( "dependant-variable~independant-variables" )

where the independant variable string is of the form:

    "indvar1+indvar2+...+indvarN"

Now, however, our independant variable strings are quite long (hundreds of 
variables) - R dies with an "input buffer overflow" error.  I've tried 
writing out the code to files and sourcing them, as well as building the 
strings incrementally in R, but these have not worked either.  I have come 
to believe there is a maximum length for char strings - some sort of 
fundamental limitation.  Is there such a max-length and, if so, is there a 
way I can work with long strings of the sort referenced above?

Thank you,
J. Wilson