A summaryFunction type function, intended to be called from
summarize to be called from summarize, which counts the
number of unique (excluding NAs) values in a variable.
Usage
uniqueValues(v, ...)
Arguments
v
A variable (vector).
...
Not in use.
Value
An object of class summaryResult with the following entries:
$feature ("No. unique values") and $result (the number of unique
values in v).