科学计算及其应用常常需要多变量函数的有关偏导数问题的计算，通常使用的计算方法是符号微分或差分近似。
Evaluation relevant to the partial derivatives of the multivariable functions is often done in scientific computation, usually by means of the symbolic differentiation or the divided difference.
文中应用偏最小二乘（PLS）回归方法建立了配电商的基于生产函数理论的成本函数模型。
Partial least-squares regression (PLS) method is applied in the construction of the production function based cost function model of electricity distribution utilities.
定义了偏凝聚函数，并验证其正确性，然后将结果推广到多输入多输出线性系统，最后简述其应用。
The partial coherence function is defined and its correctness has been verified. Then this result is extended to the linear system of multi-input and multi-output. Finally, its applications...
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