swh:1:snp:a4c99a50dc49f82b591f268001b320f8c3ca0041
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Tip revision: dc000f2a5f006d137f66716b086025d618bf8306 authored by John M Chambers on 14 July 2008, 00:00:00 UTC
version 1.0-5
Tip revision: dc000f2
dropFormula.R
dropFormula <- function(original, drop) {
    factors <- attr(terms(as.formula(original)),
                    "factors")
    row <-  match(drop, rownames(factors))
    whichTerms <- factors[row,] == 1
    labels <- colnames(factors)[whichTerms]
    text <- paste("~ . ",
                  paste("-", labels, collapse = " "))
    eval(parse(text = text))
}
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