utilities for exptracting portions of formulas.
parse.formula(formula, ...)rhs(x, ...)
lhs(x, ...)
condition(x, ...)
operator(x, ...)
# S3 method for formula
rhs(x, ...)
# S3 method for formula
lhs(x, ...)
# S3 method for formula
condition(x, ...)
# S3 method for formula
operator(x, ...)
# S3 method for parsedFormula
rhs(x, ...)
# S3 method for parsedFormula
lhs(x, ...)
# S3 method for parsedFormula
operator(x, ...)
# S3 method for parsedFormula
condition(x, ...)
a formula
an object (currently a formula or parsedFormula)
additional arguments, current ignored
an object of class parsedFormula from which information is easy to extract
currently this is primarily concerned with extracting the operator, left hand side, right hand side (minus any condition) and the condition. Improvements/extensions may come in the future.