Especially,let some coefficients of the nodes be 0,two order semi-explicit difference schemes can be deduced.
特殊的,若令某个节点前的系数为0,则得到二阶的半显格式。
In this paper, a new semiexplicit difference scheme with absolute stability for the dispersive equation u t=au xxx is given, its accuracy is higher, stability is better, it can be calculated in explicit scheme and the calculation is independent of the symbol of a.