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分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...据的冗余存储（一般工业界认为比较安全的备份数应该是3份，如：Hadoop和Dynamo）。 但是，加入更多的机器，会让我们的数据服务变得很复杂，尤其是跨服务器的事务处理，也就是跨服务器的数据一致性。这个是一个很难的问题...
Using CSS how to change only the 2nd column of a table
...raver
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Install Gem from Github Branch?
...m 'rails', :git => "git://github.com/rails/rails.git", :branch => "2-3-stable"
gem 'rails', :git => "git://github.com/rails/rails.git", :tag => "v2.3.5"
Then you run bundle install or the short form is just bundle.
Read more about it here: http://bundler.io/man/gemfile.5.html#GIT
Upd...
How do I read CSV data into a record array in NumPy?
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answered Aug 19 '10 at 6:34
AndrewAndrew
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Remove an entire column from a data.frame in R
...enome <- NULL
> head(Data)
chr region
1 chr1 CDS
2 chr1 exon
3 chr1 CDS
4 chr1 exon
5 chr1 CDS
6 chr1 exon
As pointed out in the comments, here are some other possibilities:
Data[2] <- NULL # Wojciech Sobala
Data[[2]] <- NULL # same as above
Data <- Data[,-2] ...
rgdal package installation
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tflutre
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answered Mar 6 '13 at 13:42
jubajuba
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is guava-libraries available in maven repo?
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Starting from r03, Guava releases may be found in the central Maven repository.
You may include Guava by adding the following dependency to your POM:
<dependency>
<groupId>com.google.guava</groupId>
<artifactId...
LEFT OUTER JOIN in LINQ
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Multinerd
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answered Aug 5 '10 at 10:15
ajay_whizajay_whiz
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Spring MVC @PathVariable getting truncated
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answered Aug 19 '10 at 22:03
earldouglasearldouglas
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How to calculate moving average without keeping the count and data-total?
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93
You can simply do:
double approxRollingAverage (double avg, double new_sample) {
avg -= av...