matched: Identification of units placed into matched sets

Description

Given a bipartite matching (object of class optmatch), create a logical vector of the same length indicating which units were and were not placed into matched sets.

Usage

matched(x)
unmatched()
matchfailed(x)

Arguments

Vector of class optmatch (especially as generated by a call to fullmatch).

Value

A logical vector (without names).

Details

matched and unmatched indicate which elements of x do and do not belong to matched sets, as indicated by their character representations in x.

When fullmatch has been presented with an inconsistent combination of constraints and discrepancies between potential matches, so that there exists no matching (i) with finite total discrepancy within matched sets that (ii) respects the given constraints, then the matching problem is said to be infeasible. TRUEs in the output of matchfailed indicate that this has occurred.

Examples

Run this code

# NOT RUN {
data(plantdist)

mxpl.fm0 <- fullmatch(plantdist) # A feasible matching problem
c(sum(matched(mxpl.fm0)), sum(unmatched(mxpl.fm0)))
sum(matchfailed(mxpl.fm0))
mxpl.fm1 <- fullmatch(plantdist, # An infeasible problem
                      max.controls=3, min.controls=3)
c(sum(matched(mxpl.fm1)), sum(unmatched(mxpl.fm1)))
sum(matchfailed(mxpl.fm1))

mxpl.si <- factor(c('a', 'a', 'c', rep('d',4), 'b', 'c', 'c', rep('d', 16)))
names(mxpl.si) <- LETTERS[1:26]
mxpl.exactmatch <- exactMatch(mxpl.si, c(rep(1, 7), rep(0, 26 - 7)))
# Subclass a contains two treated units but no controls;
# subclass b contains only a control unit;
# subclass c contains one treated and two control units;
# subclass d contains the remaining twenty units.
# only valid subproblems will be used

mcl <- c(1, Inf)

mxpl.fm2 <- fullmatch(plantdist + mxpl.exactmatch,
                      max.controls=mcl)
sum(matched(mxpl.fm2))

table(unmatched(mxpl.fm2), matchfailed(mxpl.fm2))

mxpl.fm2[matchfailed(mxpl.fm2)]

mxpl.fm2[unmatched(mxpl.fm2) &   # isolated units return as
         !matchfailed(mxpl.fm2)] # unmatched but not matchfailed

# }