polynomial_root_bound, an Octave code which computes the Cauchy bound on the magnitude of all roots of a polynomial with complex coefficients.
The information on this web page is distributed under the MIT license.
polynomial_root_bound is available in a C version and a C++ version and a Fortran90 version and a MATLAB version and an Octave version and a Python version.
polynomial_resultant, an Octave code which computes the resultant R of univariate polynomials P and Q.