- a
A dense array, the size of a is (nr_b, nc_c, ntico)
- b
A sparse matrix (cf. simple_triplet_matrix) of size (nr_b*ntico, nc_b) given by its fields
v, i, and j describing triplet storage.
- c
A dense array, the size of c is (ldc, nc_c, ntico), ldc must be >= ncol(b)