How to plot different lagrange interpolation graphs in one figure?

How do I plot L_0(x), L_1(x),....,L_4(x) in one figure?

I have gone completely blank on how to do this?

I am letting a=-3,b=3,n=4 and obviously i will be 4 but what do I let x be?

function  y = LPoly(a,b,n,i,x)

L=ones(n,n+1); 

for j = 1:(n+1) %

      x(j) = a + (b-a)*((j-1)/n);
  end %

for j=1:(n+1) %  

          if (i~=j);
              L(i,:)=L(i,:).*(x-x(j))/(x(i)-x(j)); 

          end %  

end % 

end % This is created to end the function.

Answer 1

[Rackelyne Urbino]

how to plot this problem using Lagrange method?

x| 1, 2, 3, 4

y|1, 2, 0, 3

at x=2.5