[Bug] transform() 的问题
>> D1=[4,2,-1,1;6,3,-1,2;12,5,-3,4;16,3,-2,2]
input> [4,2,-1,1;6,3,-1,2;12,5,-3,4;16,3,-2,2]
--------------------
4 2 -1 1
6 3 -1 2
12 5 -3 4
16 3 -2 2
--------------------
>> D1
in> D1
4 2 -1 1
6 3 -1 2
12 5 -3 4
16 3 -2 2
>> transform(D1,c1<-->c3)
-1 2 4 1
-1 3 6 2
-3 5 12 4
-2 3 16 2
>> D1
in> D1
-1 2 4 1
-1 3 6 2
-3 5 12 4
-2 3 16 2
>> transform(D1,(-1)*c1)
4 2 -1 1
6 3 -1 2
12 5 -3 4
16 3 -2 2
>> transform(D1,(-1)*c1)
-1 2 4 1
-1 3 6 2
-3 5 12 4
-2 3 16 2
还应该加入 transform 的回滚操作 rollback.