invert

Invert the operators in an object, usually a formula or expression

invert(x, ...)

# S4 method for class 'call'
invert(x)

# S4 method for class 'expression'
invert(x)

Arguments

x

function for invert

...

additional arguments passed other functions

invert is a S4 generic method for inverting relational operators, i.e.

functions prefixed with a . are not exported and should probably not be called directly

Value

The operand is returned with the relational operators inverted.

See also

op, op.type

Author

Christopher Brown

Examples

  invert( quote( A >  5 ) )
#> A <= 5
  invert( quote( A >= 5 ) )
#> A < 5
  invert( quote( A <  5 ) )
#> A >= 5
  invert( quote( A <= 5 ) )
#> A > 5
  invert( quote( A == 5 ) )
#> A != 5
  invert( quote( A != 5 ) )
#> A == 5
  invert( quote( A %in% lettters[1:5] ) )
#> A %!in% lettters[1:5]
  invert( quote( A %!in% letters[1:5] ) )
#> A %in% letters[1:5]