介绍用于C++编程的FDTD算法。FDTD(时域有限差分法)计算电磁场分布，可以在visual c++环境中运行。其中采用的格式是用C语言写的，适用于初学者。程序中ex与ey分别代表电场分量与磁场分量。-FDTD (finite difference time domain method) calculation of the electromagnetic field distribution in the visual c++ environment. Which format is us
oracl 和db2 常用语法比较： 1、取前N条记录 Oracle：Select * from TableName where rownum <= N; DB2：Select * from TableName fetch first N rows only; 2、取得系统日期 Oracle：Select sysdate from dual; DB2：Select current timestamp from sysibm.sysdummy1; 3、空值转换 Oracle：Select
