中文说明：基于matlab的求函数包络线的方法，可求出函数上下两条包络线，并有图示显示。
English Description：
Based on the MATLAB method of function envelope, the upper and lower envelope lines of the function can be obtained, and the diagram is displayed.
The method of finding function envelope
site:www.pudn.com matlab求包络 envolope在matlab matlab中envelop matlab求包络线
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中文说明：基于matlab的求函数包络线的方法，可求出函数上下两条包络线，并有图示显示。
English Description：
Based on the MATLAB method of function envelope, the upper and lower envelope lines of the function can be obtained, and the diagram is displayed.