系统辨识中，一个很重要的方法是用相关分析法辨识脉冲响应，该程序可以计算出输入和输出序列的互相关函数，以及计算出脉冲响应估计值-system identification, a very important way is to analyze the identification impulse response, the program can calculate the input and output sequence of cross-correlation function, and calculated the estimated value of the impulse response
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001139s ]
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:0.063037s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001040s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001123s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003276s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001091s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014713s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001391s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 284607 [ RunTime:0.020214s ]
