printing all matrix elements: A(0,0) = 0 A(0,1) = 0 A(0,2) = 3.1 A(0,3) = 4.6 A(1,0) = 1 A(1,1) = 0 A(1,2) = 7.2 A(1,3) = 0 A(2,0) = 0 A(2,1) = 0 A(2,2) = 0 A(2,3) = 0 A(3,0) = 2.1 A(3,1) = 2.9 A(3,2) = 0 A(3,3) = 8.5 A(4,0) = 4.1 A(4,1) = 0 A(4,2) = 0 A(4,3) = 0 matrix in triplet format (i,j,Aij): (0, 2, 3.1) (0, 3, 4.6) (1, 0, 1.0) (1, 2, 7.2) (3, 0, 2.1) (3, 1, 2.9) (3, 3, 8.5) (4, 0, 4.1) matrix in compressed column format: i = [ 1, 3, 4, 3, 0, 1, 0, 3, ] p = [ 0, 3, 4, 6, 8, ] d = [ 1, 2.1, 4.1, 2.9, 3.1, 7.2, 4.6, 8.5, ]