Analogous to Compressed Row Storage there is Compressed Column
Storage (CCS), which is also called the Harwell-Boeing
sparse matrix format [78]. The CCS format is identical to the
CRS format except that the columns of 
are stored (traversed) instead
of the rows. In other words, the CCS format is the CRS format
for 
.
The CCS format is specified by the 
arrays
{val, row_ind, col_ptr}, where
row_ind stores the row indices of each nonzero, and col_ptr
stores the index of the elements in val which start a column of .
The CCS format for the matrix in (
) is
given by
.