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
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