%Sample from p 176 of the text:

x=[-1;2;3]; y=[5;-7;-5];
A=edm(x,x);
c=A\y;
xx=linspace(-2,4); %xx is 1 x 100
v=edm(xx',x); %v is 100 x 3
yy=v*c;
plot(x,y,'r*',xx,yy);