bkt()
takes a matrix of c1 x c2
blocks where each
block has a dimension s1 x s2
and transposes its blocks. Block
B21
becomes B12
, B31
becomes B13
, etc., but
blocks are not altered internally. For instance, a matrix with rows
5 exporting countries of 4 sectors each and columns with 3
importing countries with 2 aggregated sectors, i.e., a
(5 x 4) x (3 x 2), matrix will become a (3 x 4) x (5 x 2) matrix. The
rows will now show the importing countries and the sectors they import
from, and the columns will show the the exporting countries and the
sectors they export from.