给出小波去噪的理论，在MATLAB中实现阈值估算和消噪的函数，并给出例子说明。-Given the theory of wavelet denoising in MATLAB to achieve the threshold estimation and de-noising function, and gives examples to illustrate.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001305s ]
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:0.068869s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001005s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001132s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001043s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003036s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000853s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003748s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015743s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001174s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 31698 [ RunTime:0.017936s ]
