model.frame() assumes that certain operations (e.g.
^) have special
meanings. These can be inhibited using
I(). This function inserts
a formula when encountering a specified operator or parens.
reop_formula(x, ops = c("/", "*", "^"))
a formula (or a call of length 2 or 3, for recursive processing of formulas). Other objects are returned unchanged.
a vector of character representions of operators to be inhibited.
a formula with
I() inserted where required to inhibit interpretation/conversion.
reop_formula(y ~ x * y) reop_formula(y ~ (x * y)) reop_formula(y ~ x ^ y) reop_formula(y ~ x * y ^ z)
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