InfinitySparseMatrix is a special class of distance specifications. Finite entries
indicate possible matches, while infinite or NA entries indicated non-allowed
matches. This data type can be more space efficient for sparse matching
Usually, users will create distance specification using
exactMatch. The ordering of units in an
InfinitySparseMatrix is not guaranteed to be maintained after subsetting and/or other operations are performed.
vector containing names for all control units. This will either be a character vector or NULL if units have no names
vector containing names for all treated units. This will either be a character vector or NULL if units have no names
vector of integers corresponding to control units
vector of integers corresponding to treated units
integer vector containing the number of treated and control units, in that order
function call used to create the
Mark M. Fredrickson
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