toggle.sign: toggle the sign of an expression
In formula.tools: Programmatic Utilities for Manipulating Formulas, Expressions, Calls, Assignments and Other R Objects

toggle the sign of an expression

1	toggle.sign(x)

`x`	expression

'toggle.sign' changes the sign of an expression for '+' tp '-' and visa-versa.

  toggle.sign(1:3)
  toggle.sign( quote(a) )
  toggle.sign( quote(-a) )
  
  exp <- expression( a, -b, -(a-b) )
  toggle.sign(exp)

formula.tools documentation built on May 2, 2019, 1:45 p.m.

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