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A geometric interpretation of the covariance matrix
IntroductionIn this article, we provide an intuitive, geometric interpretation of the covariance matrix, by exploring the relation between linear tran...
分类:其他好文   时间:2015-11-09 07:05:38    阅读次数:308
[CareerCup] 14.3 Final Finally Finalize 关键字比较
14.3 What is the difference between final, finally, and finalize?这道题考察我们Java中的三个看起来很相似的关键字final,finally和finalize。别看它们三长的很像,但是完全不是一回事。final用在一个变量,方法或是类...
分类:其他好文   时间:2015-11-08 14:40:11    阅读次数:168
Find the Duplicate Number 解答
QuestionGiven an arraynumscontainingn+ 1 integers where each integer is between 1 andn(inclusive), prove that at least one duplicate number must exist...
分类:其他好文   时间:2015-11-08 14:18:36    阅读次数:239
Word Pattern II 解答
QuestionGiven apatternand a stringstr, find ifstrfollows the same pattern.Herefollowmeans a full match, such that there is a bijection between a lette...
分类:其他好文   时间:2015-11-08 14:03:04    阅读次数:279
What’s the difference between an interface and an abstract class in Java?
原文What’s the difference between an interface and an abstract class in Java?It’s best to start answering this question with a brief definition of abstr...
分类:编程语言   时间:2015-11-06 07:00:39    阅读次数:304
1009,数据库查询,聚合函数,日期时间函数
SELECT 语句的逻辑处理顺序 between——在多少数和多少数之间fromonjoinwhere ——筛选条件( 比较运算符, = != ) ( 逻辑运算符, ang or )group by ——对语句进行分组with cube 或 with rolluphavingselectdistin...
分类:数据库   时间:2015-11-05 22:00:13    阅读次数:263
遥知不是雪,为有暗香来,在这寒冷而又温暖的季节里我们学过的"模糊查询和聚合函数"
年年雪里,常插梅花醉.挼尽梅花无好意,赢得满衣清泪.今年海角天涯,萧萧两鬓生华.看取晚来风势,故应难看梅花本章我们主要学习了: 1.使用 LIKE、BETWEEN、IN 进行模糊查询 2.使用聚合函数统计和汇总查询信息在模糊查询中,我们要学习的内容:10.1.1 通配符10.1.2 使用 LIKE ...
分类:其他好文   时间:2015-11-05 13:30:21    阅读次数:129
SQL查询数据的几大方法
有你,查询数据我什么都不怕。快快掌握!!出大招的工具:1.使用LIKE、BETWEEN、IN进行模糊查询eg1:SELECT * FROM StudentsWHERE 姓名like'张%'eg2:SELECT StudentID, Score FROM SCore WHERE ScoreBETWEE...
分类:数据库   时间:2015-11-05 00:42:22    阅读次数:218
What is difference between 3-layer architecture and MVC architecture?
ByVikas SinghonSep 26, 2014In 3-layer architecture3-layer architecture separates the application into 3 components which consists of Presentation Laye...
分类:Web程序   时间:2015-11-04 12:48:12    阅读次数:181
Android UI framework architecture
1.http://elinux.org/images/d/dc/Inside_Android‘s_User_Interface.pdf 2.http://stackoverflow.com/questions/7776115/android-gui-architecture-relation-between-surface-view-window-canvas 3.https://himme...
分类:移动开发   时间:2015-11-03 19:45:16    阅读次数:260
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