combination_function {tern}

Class for CombinationFunction

Description

CombinationFunction is an S4 class which extends standard functions. These are special functions that can be combined and negated with the logical operators.

Usage

## S4 method for signature 'CombinationFunction,CombinationFunction'
e1 & e2

## S4 method for signature 'CombinationFunction,CombinationFunction'
e1 | e2

## S4 method for signature 'CombinationFunction'
!x

Arguments

e1

(CombinationFunction)
left hand side of logical operator.

e2

(CombinationFunction)
right hand side of logical operator.

x

(CombinationFunction)
the function which should be negated.

Value

A logical value indicating whether the left hand side of the equation equals the right hand side.

Functions

• e1 & e2: Logical "AND" combination of CombinationFunction functions. The resulting object is of the same class, and evaluates the two argument functions. The result is then the "AND" of the two individual results.

• e1 | e2: Logical "OR" combination of CombinationFunction functions. The resulting object is of the same class, and evaluates the two argument functions. The result is then the "OR" of the two individual results.

• `!`(CombinationFunction): Logical negation of CombinationFunction functions. The resulting object is of the same class, and evaluates the original function. The result is then the opposite of this results.

Examples

higher <- function(a) {
  force(a)
  CombinationFunction(
    function(x) {
      x > a
    }
  )
}

lower <- function(b) {
  force(b)
  CombinationFunction(
    function(x) {
      x < b
    }
  )
}

c1 <- higher(5)
c2 <- lower(10)
c3 <- higher(5) & lower(10)
c3(7)