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数据存储组件 · App Inventor 2 中文网

...机上的两个不同App之间传递数据,可以在多屏应用的不同屏幕之间共享数据。 在使用AI伴侣开发应用时,使用该AI伴侣的所有应用都将共用一个微数据库,而一旦应用打包之后,数据的共享将不复存在。因此在开发过程中...
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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; ...
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C++并发编程(中文版) - 文档下载 - 清泛网 - 专注C/C++及内核技术

...… 1 1.1 什么是并发… 1 1.1.1 计算机系统的并发… 1 1.1.2 并发的方法… 3 1.2 为什么使用并发… 4 1.2.1 因划分重点而使用并发… 5 1.2.2 为了提高性能而使用并发… 5 1.2.3 什么时候不使用并发… 6 1.3 在C++中使用并发和多线程… ...
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Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版 - 文档下载 - 清泛网 - ...

Objective-C 2.0 Mac和iOS开发实践指南 PDF扫描版Objective-C Mac iOS《Objective-C 2.0 Mac和iOS开发实践指南》专门为那些想要学习Objecti Ve-C以便为Mac OS x或iOS编写程序的程序员量身打造。《Objectiv...截图: 《Objective-C 2.0 Mac和iOS开发实践指南...
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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?

... | 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

... 21 Answers 21 Active ...
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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...
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Is log(n!) = Θ(n·log(n))?

... 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...
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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 ...