numerical repcipes in fortran (2nd)这是一本在数值计算中广泛参考使用的书籍,适合作为数值计算的参考书。内容包含了线性方程组的求解,逆矩阵和行列式计算,多项式和有理函数的内插与外推,函数的积分和估值,特殊函数的数值计算,随机数的产生,非线性方程求解,傅里叶变换和FFT,谱分析和小波变换,统计描述和数据建模,常微分方程和偏微分方程求解,线性预测和线性预测编码,数字滤波,格雷码和算术码等。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002722s ]
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:0.085459s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002396s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001959s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002275s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003583s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001972s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003231s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015106s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002472s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 280110 [ RunTime:0.001141s ]