| nr.sign.chg {sfsmisc} | R Documentation |
Compute the number of sign changes in the sequence y.
nr.sign.chg(y)
y |
numeric vector. |
an integer giving the number of sign changes in sequence y.
Note that going from positive to 0 to positive is not a sign change.
Martin Maechler, 17 Feb 1993.
(y <- c(1:2,1:-1,0:-2)) nr.sign.chg(y)## = 1