The analytical truncation error formulas of a partial differential equation are given for the upstream scheme and the centered difference scheme, respectively.
然后引入参考解的办法， 用来分离更为一般的微分方程求解过程中的截断误差和舍入误差。
The finite difference scheme for centered differences in space and time is adopted.
采用时间空间中央差分进行数值求解。
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