resolution: Compute the "resolution" of a data vector.
The resolution is is the smallest non-zero distance between adjacent
values. If there is only one unique value, then the resolution is defined
to be one.
resolution(x, zero = TRUE)
should a zero value be automatically included in the
computation of resolution
If x is an integer vector, then it is assumed to represent a discrete
variable, and the resolution is 1.
resolution((1:10) - 0.5)
resolution((1:10) - 0.5, FALSE)
resolution(c(1,2, 10, 20, 50))
resolution(as.integer(c(1, 10, 20, 50))) # Returns 1