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Reshape three column data frame to matrix (“long” to “wide” format) [duplicate]
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There are many ways to do this. This answer starts with what is quickly becoming the standard method, but also includes older methods and various other methods from answers to similar questions scattered around this site.
tmp <- data.frame(x=g...
Overloading Macro on Number of Arguments
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Does not work on Microsoft Visual Studio 2010, VA_ARGS seems to be expanded into a single macro argument.
– Étienne
Oct 28 '14 at 11:32
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Save modifications in place with awk
... one. If you instead want to treat each file independently, you'll need to do something like for f in *.txt; do gawk -i inplace '!seen[$0]++' "$f"; done
– Nick K9
Jan 17 '19 at 18:10
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Is modern C++ becoming more prevalent? [closed]
...ou're comfortable writing regular for loops, changing to use std::for_each doesn't buy you much except the warm fuzzy feeling that you're doing things the "modern" way.
Now, we have instructors and book writers who have been using the whole of C++, and getting their instructions from that perspecti...
What is a vertical tab?
...rogram as a character constant. From the keyboard, it would be CTRL-K.
I don't believe anyone would have a reason to use it any more. Most forms are generated in a printer control language like postscript.
@Talvi Wilson noted it used in python '\v'.
print("hello\vworld")
Output:
hello
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Regex: Remove lines containing “help”, etc
I have a long document of commands. Using Notepad++ or regex, I want to delete all lines containing "help" including keyboard_help, etc.
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Creating a zero-filled pandas data frame
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Note that you may run into int/float issue if you will be doing something like d.set_value(params) after initializing d to contain 0's. An easy fix is: d = pd.DataFrame(0.0, index=np.arange(len(data)), columns=feature_list).
– ximiki
Aug 29 '17...
How to get the children of the $(this) selector?
... If the node is a direct child, wouldn't it be fastest to just do $(this).children('img'); ?
– adamyonk
Aug 5 '11 at 11:58
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Paste a multi-line Java String in Eclipse [duplicate]
... part you end up with "asdf\\\"asdf". in fact, i think what eclipse should do is have a new ctrl+shift+v shortcut that pastes escaped.
– kritzikratzi
Jun 6 '13 at 22:56
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Which is better: … or …
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Do you need a type attribute at all? If you're using HTML5, no. Otherwise, yes. HTML 4.01 and XHTML 1.0 specifies the type attribute as required while HTML5 has it as optional, defaulting to text/javascript. HTML5 is now wide...