来自百度百科：
A = [1, 2, 3; 4, 5, 6; 7, 8, 9; 10, 11, 12]
rowrank = randperm(size(A, 1)); % 随机打乱的数字，从1~行数打乱
B = A(rowrank, :)%%按照rowrank打乱矩阵的行数
一个可能的输出结果：
A =
1 2 3
4 5 6
7 8 9
10 11 12
B =
1 2 3
7 8 9
4 5 6
10 11 12