code: public void setEigenvalues(double eigmin, double eigmax) {
          this.eigmin = eigmin;
          this.eigmax = eigmax;
  
          if (eigmin <= 0)
              throw new IllegalArgumentException("eigmin <= 0");
          if (eigmax <= 0)
              throw new IllegalArgumentException("eigmax <= 0");
          if (eigmin > eigmax)
              throw new IllegalArgumentException("eigmin > eigmax");
      }
docs: Sets the eigenvalue estimates.
  
  @param eigmin
  Smallest eigenvalue. Must be positive
  @param eigmax
  Largest eigenvalue. Must be positive