采样电流数据，为了查看电流波形突变特征，计算电流波形斜率。此程序运用matlab计算电流波形斜率，通过实际运行，matlab显示采样电流波形和计算得到的斜率，效果良好。——
In order to view the current waveform mutation characteristics, the program using matlab to calculate slope current waveform.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000888s ]
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:0.059400s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000962s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000792s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.002998s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001711s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014866s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001117s ]
UPDATE `jrk_articles` SET `hits` = 3 WHERE `id` = 20866 [ RunTime:0.019371s ]
