signp {cwhmath} | R Documentation |
sign
returns a vector with the signs of the corresponding
elements of x (the sign of a real number is 1, 1, or -1 if the number is positive, zero, or negative, respectively).
Note that sign does not operate on complex vectors.
signp(x)
x |
a numeric vector |
Christian W. Hoffmann, christian.hoffmann@wsl.ch,
http://www.wsl.ch/staff/christian.hoffmann
signp(-2:3)# -1 -1 1 1 1 1 (m <- matrix(rnorm(9),3,3)) m %*% diag(signp(diag(m)))