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Difference between `set`, `setq`, and `setf` in Common Lisp?
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SouravSourav
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How to colorize diff on the command line?
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Trevor Boyd Smith
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answered Nov 12 '13 at 13:27
Lars BaehrenLars Baehren
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
....122369 -128.122613
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23 2000 12 63.436507 449.794454
24 2001 12 999.472226 922.726589
See ?aggregate, the formula argument and the examples.
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Testing modules in rspec
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How to express a One-To-Many relationship in Django
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rolling stonerolling stone
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What does the git index contain EXACTLY?
...7fa005ff12ad89437f2fdc80926e21c 0 .gitignore
100644 5529b198e8d14decbe4ad99db3f7fb632de0439d 0 .mailmap
The Racy git problem gives some more details on that structure:
The index is one of the most important data structures in git.
It represents a virtual working tree state by recording list of...
MongoDB not equal to
...u would like to use $not is:
db.inventory.find( { price: { $not: { $gt: 1.99 } } } )
That would select all documents where:
The price field value is less than or equal to 1.99 or the price
Field does not exist
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How to set default values in Rails?
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"Correct" is a dangerous word in Ruby. There's usually more than one way to do anything. If y...
Discuz X 首页白板解决之道 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...现问题的大致位置。可以毫不夸张地说，排除法能够解决99.99%的疑难杂症。
3、白板的最核心原因是调用函数 ob_end_clean() 函数导致的，先将输出内容清掉再把备份内容重新输出，如果重新输出的某个地方有问题那网页就白板了...
Keyboard shortcuts in WPF
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I found this to be exactly what I was looking for related to key binding in WPF:
<Window.In...