大衍揲扐法与清华简《筮法》揲扐法再探讨

Further Discussion on the Method of Counting off Stalks in the Dayan Divination and that in the Shifa Chapter on the Tsinghua Bamboo Slips

数字卦的占筮法应为揲扐法,对揲扐法的一般规律加以计算分析,可以发现实用蓍策数量、挂一之法以及揲数等变量都会影响最后得数的概率。据此推断,大衍筮法的挂一步骤应是每变挂一,挂一的蓍策不带入下一变,下一变重新从蓍策总数中取用。清华简《筮法》揲扐法,或为用六十根蓍策,虚取一挂四根,分二,挂一,揲四,归奇于扐,五变后得一爻,凡六十变成一组卦。

The method of counting off stalks in the numerical hexagrams should be the shele method. The calculation and analysis of the general rules of shele method reveal that variables such as the number of stalks, the method of hanging the one, and the number of the stalks counted off will all affect the probability of the final number. Based on this, it can be inferred that the step of hanging the one of the Dayan(grand expansion) divination in the Yijing should be hanging one for each change, the one stalk will not be carried into the next change, and the next change will be taken from the total number of stalks again. The shele method of Chapter Shifa(Method of Divination) on Tsinghua bamboo slips may use sixty stalks, take one and hang four stalks, divide into two, hang one, count off stalks by four, put the remainder between fingers, then get one line after five changes and after sixty changes get a pair of two hexagrams.