| sign {base} | R Documentation |
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).
Note that sign does not operate on complex vectors.
sign(x)
x |
a numeric vector |
sign(pi) # == 1 sign(-2:3)# -1 -1 0 1 1 1