Sort Vectors by Priority — priority

Sort vectors, prioritizing according to levels specified. Uses base::factor() internally with unspecified arguments disabled.

Usage

priority_sort(x, levels, exclude = NA)

x: a vector of data, usually taking a small number of distinct values.
levels: an optional vector of the unique values (as character strings) that x might have taken. The default is the unique set of values taken by as.character(x), sorted into increasing order of x. Note that this set can be specified as smaller than sort(unique(x)).
exclude: a vector of values to be excluded when forming the set of levels. This may be factor with the same level set as x or should be a character.