Algorithm 493: Zeros of a Real Polynomial [C2]

TLDR: Double precision vector of coefficients in order of decreasing powers of the variable D E G R E E E integer degree of the polynomial ZEROR, double precision vectors of real and imaginary parts of the zeros found ZEROI by the algorithm FAIL logical parameter.

Abstract: OP double precision vector of coefficients in order of decreasing powers of the variable D E G R E E integer degree of the polynomial ZEROR, double precision vectors of real and imaginary parts of the zeros found ZEROI by the algorithm FAIL logical parameter which is true only if the leading coefficient is zero or if RPOLY has found fewer than degree zeros; in the latter case the degree is reset to the number of zeros found.