sign returns a vector with the signs of the corresponding elements of
x (the sign of a real number is 1, 0, or -1 if the number is positive, zero, or negative, respectively).
sign does not operate on complex vectors.
- a numeric vector
This is an internal generic primitive function: methods can be defined for it directly or via the
Math group generic.
Documentation reproduced from R 3.0.1. License: GPL-2.