Using Matlab, write a function called poly_val that is called like this p = poly_val(c0,c,x), where c0 and x are scalars, c is a vector, and p is a scalar. If c is an empty matrix, then p = c0. If c is a scalar, then p = c0 + c*x . Otherwise, p equals the polynomial, 0+1 +2 ++ , where N is the length of the vector c. Hint: you may want to use the .^ operator. Here are three example runs: >> format long

>> p = poly_val(-17,[],5000)

p = -17

>> p = poly_val(3.2,[3,-4,10],2.2)

p = 96.920000000000030

>> p = poly_val(1,[1,1,1,1],10)

p = 11111