利用四点格式生成等值线图的内边界曲线，给出了带内边界约束条件的等值线图的绘制算法。
In this paper, a drawing algorithm of contour lines with inner boundary constraints is obtained by the inner boundary curves of contour lines generated by using four-point method.
在均匀格点的基础上，给出了基于柱坐标的全矢量非均匀格点有限差分方法(FDM)，并采用了完美匹配层(PML)边界条件。
A general formula is derived for a finite-difference method (FDM) with non-uniform grids in a cylindrical coordinate system, and a perfectly matched layer (PML) is used for the boundary treatment.
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