用matlab来制作卫星绕地球做周期运动的动画，改变卫星的角速度的初值，可以画出圆形，椭圆形，逃逸轨迹。-Using matlab to produce satellites orbiting the earth to do periodic motion animation, change the initial angular velocity of the satellite, you can draw round, oval, escape trajectory.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001133s ]
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:0.105353s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001216s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001236s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004532s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001123s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015209s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001227s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 33598 [ RunTime:0.001304s ]
