function r = poly_to_factor ( c )

%*****************************************************************************80
%
%% poly_to_factor converts a polynomial from power form to factor form.
%
%  Input:
%
%    real c(d+1): the coefficients.
%
%  Output:
%
%    real r(d): the polynomial roots.
%    (Actually, these values could be complex.)
%
  r = roots ( c(end:-1:1) );

  return
end   
