the values to be matched against: converted to a character
vector. Long vectors are not supported.
the (integer) value to be returned at non-matching
An integer vector of the same length as x, giving the
indices of the elements in table which matched, or nomatch.
Exact matches are preferred to partial matches (those where the value
to be matched has an exact match to the initial part of the target,
but the target is longer).
If there is a single exact match or no exact match and a unique
partial match then the index of the matching value is returned; if
multiple exact or multiple partial matches are found then 0 is
returned and if no match is found then nomatch is returned.
NA values are treated as the string constant "NA".