i1 : M = matrix"1,2;3,4"; 2 2 o1 : Matrix ZZ <--- ZZ
i2 : simpleDocFrob(3,M) o2 = | 1 2 0 0 0 0 | | 3 4 0 0 0 0 | | 0 0 1 2 0 0 | | 0 0 3 4 0 0 | | 0 0 0 0 1 2 | | 0 0 0 0 3 4 | 6 6 o2 : Matrix ZZ <--- ZZ