First of all, a function set is defined, in which the derivative of the elements can be linearly represented by the elements;
首先，定义了一个函数类的集合，该集合中元素的导数可以由该集合中的元素线性表出；
Using a compressibility coordinate transformation, a set of the first derivative differential equations has been derived.
采用了压缩性的坐标变换后，推导得到了五个一阶导数的微分方程组。
The original spectrum is processed by using first derivative, and applying Partial Least-Squares method to set up linear mathematical model.
采用一阶导数方法对光谱进行预处理；利用偏最小二乘法建立模型。
The original spectrum is processed by using first derivative, and applying Partial Least-Squares method to set up linear mathematical model.
采用一阶导数方法对光谱进行预处理；利用偏最小二乘法建立模型。
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