Parse Formulas

Utilities for extracting portions of formulas.

parse.formula(formula, ...)

rhs(x, ...)

lhs(x, ...)

condition(x, ...)

operator(x, ...)

# S3 method for class 'formula'
rhs(x, ...)

# S3 method for class 'formula'
lhs(x, ...)

# S3 method for class 'formula'
condition(x, ...)

# S3 method for class 'formula'
operator(x, ...)

# S3 method for class 'parsedFormula'
rhs(x, ...)

# S3 method for class 'parsedFormula'
lhs(x, ...)

# S3 method for class 'parsedFormula'
operator(x, ...)

# S3 method for class 'parsedFormula'
condition(x, ...)

Arguments

formula,

a formula

...

additional arguments, current ignored

x,

an object (currently a formula or parsedFormula)

Value

an object of class parsedFormula from which information is easy to extract

Details

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.