public double findMinimum(UnivariateFunction f,int fracDigits){
  double tol=Math.pow(10,-1 - fracDigits);
  final double optx=optimize(f,tol);
  return optx;
}

public double findMinimum ( UnivariateFunction f , int fracDigits ) { double tol = Math . pow ( 10 , - 1 - fracDigits ) ; final double optx = optimize ( f , tol ) ; return optx ; }
find minimum ( no first estimate given , desired number of fractional digits specified )
