本文用分片线性元离散椭圆型问题。用预处理共轭梯度法求解有限元方程。
In this paper, the elliptic problems are discreted by linear elements, the finite element system are solved by PCG method.
讨论了在一个时期内商品的订购价格有折扣，而且该商品的需求量是离散型随机变量的订购问题，得出了使利润最大化的最佳订购量的计算方法。
In a given period the seasonal goods can be ordered at a discount price, and the demand for the goods is an issue of discrete random variable.
对常用的几种评分方法进行了分析讨论，指出了用于离散型变量的预报评分存在的问题，并提出了一种新的预报技术评分方法。
Analyzing about the usual methods of score, pointing out the disadvantage of forecast score of discrete variables, a new method of forecast technic score(FTS) was bring forward.
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