poly()                   Generate a Polynomial from Arguments
 
 #include   <math.h>
 
 double     poly(x,n,c);
 double     x;
 int        n;
 double     c[];
 
    poly() generates a polynomial in 'x', of degree 'n', with
    coefficients c[0], c[1],...,c[n].  For example, if n = 4, the
    generated polynomial is
 
            c[4]x^4 + c[3]x^3 + c[2]x^2 + c[1]x + c[0]
 
    Returns:    The value of the polynomial as evaluated for 'x'.