y [ ] [ ] is used for difference table and y [ ] [ 0 ] used for input
double [ ] [ ] y = new double [ n ] [ n ] ; y [ 0 ] [ 0 ] = 46 ; y [ 1 ] [ 0 ] = 66 ; y [ 2 ] [ 0 ] = 81 ; y [ 3 ] [ 0 ] = 93 ; y [ 4 ] [ 0 ] = 101 ;