Check that variables in formula are present in the data
Usage
checkFormula(formula, data)
Arguments
- formula
formula of variables to check
- data
data.frame storing variables in the formula
Value
If formula is valid, return TRUE. Else throw error
Examples
# Valid formula
dreamlet:::checkFormula(~speed, cars)
# Not valid formula
# dreamlet:::checkFormula( ~ speed + a, cars)
