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How to sort a dataframe by multiple column(s)
I want to sort a data.frame by multiple columns. For example, with the data.frame below I would like to sort by column z (descending) then by column b (ascending):
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printf with std::string?
My understanding is that string is a member of the std namespace, so why does the following occur?
7 Answers
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C default arguments
Is there a way to specify default arguments to a function in C?
19 Answers
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How do I commit only some files?
I have two projects. One is the "official" project and the second is a light modification (some files added). I created new branch and I put new files to them. But in during development some files common to both branches is changed.
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Convert a String In C++ To Upper Case
How could one convert a string to upper case. The examples I have found from googling only have to deal with chars.
29 Answ...
Why does a function with no parameters (compared to the actual function definition) compile?
I've just come across someone's C code that I'm confused as to why it is compiling. There are two points I don't understand.
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Designer Added then removed by Visual Studio on load/unload
Anyone see this before? I have a large Visual Studio project that keeps adding [Subtype]Designer[/Subtype] to my .vcproj then removing it on the next open and close of the project. There is only one class defined in StoredImageControl.cs . Anyone know how to shut this off as it is really mess...
Visual Studio Clicking Find Results Opens Code in Wrong Window
..."Find in Files" the results are returned to the "Find Results 1" window which is docked below my code editor window.
7 Answ...
完美解决phpcms批量移动内容后，新闻心情、评论排行等不更新的问题 - 更多...
完美解决phpcms批量移动内容后，新闻心情、评论排行等不更新的问题问题描述：phpcms批量移动内容 文章，批量更新URL -> "批量更新内容页"后，发现原内容的评论、新闻心情全部丢失，这还不算差，后台评论排...问题描述：
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Equivalent of jQuery .hide() to set visibility: hidden
In jQuery, there are .hide() and .show() methods which sets the CSS display: none setting.
6 Answers
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