说明：  基于matlab计算洛伦兹-朱德模型的matlab源代码，只需运行程序代码选择金属名称和模型类型即可自动输出不同频率下的介电常数值，非常方便
(Based on the calculation of the Lorentz matlab- Zhu model matlab source code, simply run the program code to select the name and model type of metal can be automatically output dielectric constant values ​ ​ for different frequencies, very convenient)