O 因子正定 N 由 N 矩阵成低密度脂蛋白 A * * T，
L 在哪里与部分沿对角线的下三角矩阵
D 是一个对角矩阵与积极的条目
在对角线上
输入： 维度 N;1 条目 A(I,J) < = I J < = A.N
输出： 条目 L(I,J) 1 < = J < 我 1 < = I < = N L 和 D(I)，
1 < = I < = D.N
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001118s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.086836s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001617s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001234s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001037s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003189s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000910s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.009077s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015885s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001219s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 284137 [ RunTime:0.028740s ]
