根据已知的三维离散数据（x,y,z）,在MATLAB中利用此函数进行三维曲面拟合，再根据polyval2d得出拟合函数的系数矩阵。-according to 3D discrete datum (x,y,z),use this function in MATLAB to fit 3D surface, and use polyval2d to get coefficient matrix
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000923s ]
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:0.059323s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000985s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001420s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001049s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003329s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000935s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003940s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.019706s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001504s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 3786 [ RunTime:0.045654s ]
