sign
Signum Function
Description
Extracts the sign of each element in a vector and returns a vector of numeric values of the same length as the input.
Usage
sign(x)
Arguments
| x |
an atomic object. Missing values (NA) are allowed.
|
Details
Missing values in the argument(s) create missing values in the result.
Value
For a numeric argument, returns 1, 0, and -1 corresponding to
positive, zero, or negative values of the argument. For complex data,
the result is equal to x/Mod(x) when x is not zero, and
it is equal to 0+0i when it is zero.
sign is not defined for character data.
See Also
Examples
x <- c(-Inf, -3.14, 0, 3.14, Inf)
sign(x)
# [1] -1 -1 0 1 1
sign(x)*sqrt(abs(x)) # a signed square root