矩阵求逆。输入任意的矩阵，能判断该矩阵是否可逆，如果可逆，能给出逆阵，否则，提示该矩阵不存在逆矩阵。-Matrix inversion. Arbitrary input matrix, the matrix can judge whether or not reversible, if reversible, can be given against the array, otherwise, suggesting that the matrix inverse matrix does not exist.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001714s ]
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:0.155872s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001850s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002122s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001389s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004887s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001634s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004437s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015392s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001162s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 245191 [ RunTime:0.101356s ]
