Blocked Infinity Sparse Matrices are similar to Infinity Sparse Matrices, but they also keep track of the groups of units via an additional slot, groups

## Slots

groups

factor vector containing groups, with unit names as labels, when possible

colnames

vector containing names for all control units. This will either be a character vector or NULL if units have no names

rownames

vector containing names for all treated units. This will either be a character vector or NULL if units have no names

cols

vector of integers corresponding to control units

rows

vector of integers corresponding to treated units

dimension

integer vector containing the number of treated and control units, in that order

call

function call used to create the InfinitySparseMatrix

match_on, exactMatch, fullmatch, InfinitySparseMatrix-class