code: func (wrng WeibullGenerator) Weibull(lambda, k float64) float64 {
  	if !(lambda > 0.0) {
  		panic(fmt.Sprintf("Invalid parameter lambda: %.2f", lambda))
  	}
  
  	if !(k > 0.0) {
  		panic(fmt.Sprintf("Invalid parameter k: %.2f", k))
  	}
  
  	return wrng.weibull(lambda, k)
  }
docs: // Weibull returns a random number of weibull distribution (lambda > 0.0 and k > 0.0)