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.
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。
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This paper explains the characteristics of the symbolic differentiation programs system, its functions, the idea of its design, and the technique of its programming.
本文说明了符号微分程序系统的一些特征、功能、设计思想和程序设计技术。
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Results: the index form of the metric diagnosis and pattern differentiationof TCM against opium abstinent syndrome has favorable effective functions for the diagnosis.