中文说明：用matlab快速求斜率，方法简单易行，程序条理可靠。
English Description：
Using MATLAB to calculate the slope quickly, the method is simple and easy, and the program is organized and reliable.
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中文说明：用matlab快速求斜率，方法简单易行，程序条理可靠。
English Description：
Using MATLAB to calculate the slope quickly, the method is simple and easy, and the program is organized and reliable.