Lookup searches the positions of (first) matches of the argument x in its second argument idx and returns the according values from ret.
Usage
Lookup(x, ref, val)
Arguments
x
vector: the values to be matched. Long vectors are supported.
ref
vector: the values to be matched. Long vectors are supported.
val
vector: the values to be returned.
Value
A vector of the same length as x
giving the elements in ret at the position in idx of the first match if there is a match, otherwise nomatch.
Details
This function is wrapping the function match allowing to pass a vector from which the found elements should be returned. This is often used in a code lookup situation and might be simpler than using match or merge.