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Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注C/C++及内核技术
...于是上网查啊查，那时又不愿意看英文，发现就根本没有中文的文档介绍Makefile，只得看别人写的Makefile，自己瞎碰瞎搞才积累了一点知识，但在很多地方完全是知其然不知所以然。后来开始从事UNIX下产品软件的开发，看到一个4...
Makefile经典教程（入门必备） - C/C++ - 清泛网 - 专注C/C++及内核技术
...于是上网查啊查，那时又不愿意看英文，发现就根本没有中文的文档介绍Makefile，只得看别人写的Makefile，自己瞎碰瞎搞才积累了一点知识，但在很多地方完全是知其然不知所以然。后来开始从事UNIX下产品软件的开发，看到一个4...
How do I do base64 encoding on iOS?
..., 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
};
@implementation NSString (NSStringAdditions)
+ (NSString *) base64StringFromData: (NSData *)data length: (int)length {
unsigned long ixtext, lentext;
long ctremaining;
...
Remove rows with all or some NAs (missing values) in data.frame
... final[complete.cases(final), ]
gene hsap mmul mmus rnor cfam
2 ENSG00000199674 0 2 2 2 2
6 ENSG00000221312 0 1 2 3 2
na.omit is nicer for just removing all NA's. complete.cases allows partial selection by including only certain columns of the dataframe:
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How to remove a key from Hash and get the remaining hash in Ruby/Rails?
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edited Mar 20 '15 at 1:27
answered Jun 19 '12 at 17:03
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Calculate difference in keys contained in two Python dictionaries
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21 Answers
21
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CGRidCtrl控件 学习心得 - C/C++ - 清泛网 - 专注C/C++及内核技术
...定制和延伸。目 录
1 引言... 1
1.1 目的... 1
1.2 参考资料... 1
2 Grid控件介绍... 1
2.1 功能介绍... 1
2.2 框架介绍... 2
2.3 主要类介绍... 4
2.3.1 CGridCtrl类... 4
2.3.2 CGridCellCheck类... 5
2.3.3 CGridCel...
Is log(n!) = Θ(n·log(n))?
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Remember that
log(n!) = log(1) + log(2) + ... + log(n-1) + log(n)
You can get the upper bound by
log(1) + log(2) + ... + log(n) <= log(n) + log(n) + ... + log(n)
= n*log(n)
And you can get the lower bound by doing a simil...
Why does Math.Round(2.5) return 2 instead of 3?
In C#, the result of Math.Round(2.5) is 2.
15 Answers
15
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What is the difference between '/' and '//' when used for division?
Is there a benefit to using one over the other? In Python 2, they both seem to return the same results:
13 Answers
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