Sign function with zero option
sign returns a vector with the signs of
the corresponding elements of x, being
1, zero, or -1 if the number is positive,
zero or negative, respectively.
This generalizes the
sign function in the
base package to allow something
other than 0 as the the "sign" of 0.
sign(x, zero=0L)
x |
a numeric vector for which signs are desired |
zero |
an |
an integer vector of the
same length as x assuming
values 1, zero and -1, as discussed
above.
## ## 1. default ## sx <- sign((-2):2) # check all.equal(sx, base::sign((-2):2)) ## ## 2. with zero = 1 ## s1 <- sign((-2):2, 1) # check all.equal(s1, rep(c(-1, 1), c(2,3)))
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