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Remove columns from dataframe where ALL values are NA
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How can I create a UIColor from a hex string?
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What does the [Flags] Enum Attribute mean in C#?
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Scala 2.8 breakOut
In Scala 2.8 , there is an object in scala.collection.package.scala :
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How do I check that multiple keys are in a dict in a single pass?
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answered Aug 17 '09 at 2:18
hughdbrownhughdbrown
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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
... 1T 数据，压力太大了！在分给4个机器后，每个机器都是256G，则分摊了集中在一台机器的压力。也许有人问一台机器硬盘加大一点不就可以了，为什么要分给四台机器呢？不要光想到存储空间，实际运行的数据库还有硬盘的读写...
Get a specific bit from byte
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Easy. Use a bitwise AND to compare your number with the value 2^bitNumber, which can be cheaply calculated by bit-shifting.
//your black magic
var bit = (b & (1 << bitNumber-1)) != 0;
EDIT: To add a little more detail because there are a lot of similar answers with no expla...
What's the simplest way to test whether a number is a power of 2 in C++?
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edited Dec 2 '15 at 3:59
jbranchaud
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How to use/install gcc on Mac OS X 10.8 / Xcode 4.4
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Update:
You can now just run the following command from your terminal:
xcode-select --install...