阶段2：使用范例和指南进行微小迭代
Stage 2: Hands-on mini iteration with samples and guidelines
本文首先介绍一下关键概念，然后使用范例portlet程序来展示一下这些概念。
The key concepts of this article are explained first, and then these concepts are illustrated by using a sample portlet application.
使用范例 下面的例子求解了一个线性方程Ax = b，矩阵规模为 3 * 3,最后算出了残差的范式。
Example of Use. The following simple example solves a 3x3 linear system Ax=b and computes the
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