x = [-2 -1 0 1 2]

-8 3 -5 6 6]

a polyfit (x, y, 4)
x1 linspace (-2,2)
yl polyval (a,x1)
%Lagrange interpolation

1

t = [ 00102091 ]
al polyfit (t,x, 4)
a2 polyfit (t,y, 4)
t1 linspace (0,1)
x2 polyval (al, t1)
y2= polyval (a2, t1)
plot (x2,42, xl, yl,X,Y,'*')