1. Permutations P:
execute row exchanges
becomes PA LU for any invertible A
Permutations P identity matrix with reordered rows
mn (n-1) ... (3) (2) (1) counts recordings, counts all nxn permuations
对于nxn矩阵存在着n!个置换矩阵
,
2. Transpose: 2.…
Another app is currently holding the yum lock; waiting for it to exit…
报错详情:
[rootlocalhost debug]# sudo yum makecache
Loaded plugins: fastestmirror
Existing lock /var/run/yum.pid: another copy is running as pid 87965.
Another app is curr…