>> x=0:0.1:6;

>> y=-((x-2).*(x-4).*(x-6)/48)-(x.*(x-4).*(x-6)/16)+(x.*(x-2).*(x-6)/16)+(x.*(x-2).*(x-4)/48);

>> plot (x,y)

>> grid

>> hold on

>> plot (0,1,'+r')

>> plot (2,-1,'+r')

>> plot (4,-1,'+r')

>> plot (6,1,'+r')

>> hold on

>> x=0:0.1:6;

>> y1=1-x+x.*(x-2)/4;

>> plot (x,y1,'.g')

>> title('Lagrange Interpolating Polynomial vs Newton Divided Difference')

>> text(0,1,'(0,1)')

>> text(2,-1,'(2,-1)')

>> text(4,-1,'(4,-1)')

>> text(6,1,'(6,1)')