aa =
1 2 3 4
5 6 7 0
0 2 0 7
d=((aa==0)==0)
d =
3×4 logical 数组
1 1 1 1
1 1 1 0
0 1 0 1
aa =
1 2 3 4
5 6 7 0
0 2 0 7
d=((aa==0)==0)
d =
3×4 logical 数组
1 1 1 1
1 1 1 0
0 1 0 1