formula_to_function {QCAtools}

Convert formula to function

Description

When given a Boolean formula (in disjunctive normal form, see details), this function produces a function that takes a data.frame of a QCA data table and computes the fuzzy set score for each case of membership in the set described by the formula

Usage

formula_to_function(formula)

Arguments

formula

A string or vector of strings containing a Boolean formula in disjunctive normal form

Details

Set names must be capitalized in the formula and the data; if they are lowercase, they are interpreted as the negation of the set. If formula is a string, logical 'or' is expressed as a '+', and logical 'and' as a '*'. If formula is a list of strings, the strings are assumed to be the dosjuncts and are concatenated with '+'. Disjunctive normal form means that the formula must be a disjunction of conjunctions of elementary or negated elementary sets. Example: A*b*C + a*B

Value

a function that takes a data.frame and computes the fuzzy set score of the set described by the formula for each case into a vector

Examples

formula_to_function("A*b*C + a*B")