public void testSliceSparse() {
SparseMatrixLil A = sprand(5, 8);
SparseMatrixLil B = sprand(5, 12);
SparseMatrixLil C = sprand(4, 8);
SparseMatrixLil AB = A.concatRight(B);
assertTrue(A.equals(AB.cols(0, 8)));
assertTrue(B.equals(AB.cols(8, 20)));
SparseMatrixLil AC = A.concatDown(C);
assertTrue(A.equals(AC.rows(0, 5)));
assertTrue(C.equals(AC.rows(5, 9)));
A = spzeros(1, 5);
A.append(0, 2, 3);
assertEquals(A.row(0).cols, 5);
}
