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leetcode Plus One python
Plus OneGiven a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significant dig...
分类:编程语言   时间:2015-06-14 06:58:52    阅读次数:166
sqlserver性能调优方法论与常用工具
早期的文章中,曾经提到过性能调优中的DETECT方法论,这里先简单回顾一下DETECT方法论。Discover the problem :发现问题Explore the conditions:探究原因Track down possible approaches:提供可能解决的方式Execute the most likely approach:执行最好可能的解决方式Check of success...
分类:数据库   时间:2015-06-13 12:56:09    阅读次数:149
怎么样putty打开图形化管理工具,在终端上
有时需要在putty这种图形终端开放的图形化管理工具将出现以下错误:[root@node2 ~]# Traceback (most recent call last):File "/usr/share/virt-manager/virt-manager.py", line 383, in main(...
分类:其他好文   时间:2015-06-13 08:37:13    阅读次数:281
[LeetCode] Longest Substring with At Most Two Distinct Characters
Problem Description:Given a string, find the length of the longest substring T that contains at most 2 distinct characters.For example, Given s =“eceb...
分类:其他好文   时间:2015-06-12 22:04:43    阅读次数:103
<?>和<? extends Object>的区别
From a practical point to most people, <? extends Object> is the same as <?>, like everyone have suggested here. However, they differ in two very minor and subtle points: The JVMS (Java Virtual Mac...
分类:其他好文   时间:2015-06-12 17:36:23    阅读次数:228
No.66 Plus One
No.66 Plus OneGiven a non-negative number represented as an array of digits, plus one to the number.The digits are stored such that the most significa...
分类:其他好文   时间:2015-06-11 22:52:05    阅读次数:144
cvCreateMTStumpClassifier中MT的含义
我在研究这个函数代码的过程中,老师搞不清楚这个函数的MT的含义,困扰了我很长时间。一开始我猜测是most threshold,或者是其他的几个,以为是错误的,我就不说了。最后终于搞清楚了--------cvCreateMTStumpClassifier函数(这是一个生成多阈值(Multi-threshold)stump分类器的函数)。...
分类:其他好文   时间:2015-06-11 19:26:52    阅读次数:119
The Single Responsibility Principle
The Single Responsibility PrincipleRobert C. Martin (Uncle Bob)ONE OF THE MOST FOUNDATIONAL PRINCIPLES OF GOOD DESIGN IS: Gather together those things that change for the same reason, and separate tho...
分类:其他好文   时间:2015-06-11 09:26:36    阅读次数:115
[Python] round函数
在Python中,round函数对小数进行四舍五入的截断。然而:>>> round(3.55, 1)3.5官方文档对于函数的解释是:Unfortunately, most decimal fractions cannot be represented exactly as binary fracti...
分类:编程语言   时间:2015-06-11 06:54:56    阅读次数:326
为什么对一些矩阵做PCA得到的矩阵少一行?
很多时候会出现把一个N*M的矩阵做pca(对M降维)之后却得到一个M*(M-1)矩阵这样的结果。之前都是数学推导得到这个结论,但是,今天看到一个很形象的解释:Consider what PCA does. Put simply, PCA (as most typically run) creates...
分类:其他好文   时间:2015-06-10 23:47:31    阅读次数:207
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