title: Finding complex root in Fortran
body: <p>i found some sources where algorithms are suggested to determine complex roots in general analytic functions (no polynomials). E.g. "A Fortran program for solving a nonlinear equation by Muller's
  method", written by I. Barrodale and K. B. Wilson. Unfortunately the code is only available in pdf format and the transfer to ASCII is quite cumbersome... And also Henning Bach, Volume 121, Number 12, page 675-678, December 1969. Its available in ASCII. The letter one works fine but is quite slow for my purpose. Is there a standard routine for computing complex roots in Fortran?</p>
  
  <p>Thanks :) </p>