By means of Sherman Morrison theorem,the solving procedure of DCM needs only little computation but has very good numeric stability. Moreover, the program structure of DCM is as simple as that of LCM.

• 本文利用Sherman Morrison定理 ,使得DCM仅需很少的运算量 ,对经典的LCM程序做少量的修补 ,即可造就一个有良好数值特性的DCM程序