连续相位调制信号(CPM)产生，该函数用来计算任意函数的一阶偏导数(数值方法),用于特征降维，特征融合，相关分析等。- Continuous phase modulation signal (CPM) to produce, This function is used to calculate the arbitrary function of the first order partial derivative (numerical methods), For feature reduction, feature fusion, correlation analysis.