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How to sort a dataframe by multiple column(s)
...rame 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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Control the size of points in an R scatterplot?
In R, the plot() function takes a pch argument that controls the appearance of the points in the plot. I'm making scatterplots with tens of thousands of points and prefer a small, but not too small dot. Basically, I find pch='.' to be too small, but pch=19 to be too fat. Is there somethin...
How to get back to most recent version in Git?
...run the previous version of a script through a debugger, so I did git checkout <previous version hash> and did what I needed to do.
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WCF vs ASP.NET Web API [closed]
...to enable SOAP-based services. For simpler RESTful or RPCish services (think clients like jQuery) ASP.NET Web API should be good choice.
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JavaScript string newline character?
...just fine when setting the value, though IE and Opera will convert that back to \r\n again internally. There's a SitePoint article with some more details called Line endings in Javascript.
Note also that this is independent of the actual line endings in the HTML file itself (both \n and \r\n give t...
How to initialize const member variable in a class?
...lly included into many translation units. However, to avoid complicated linker rules, C++ requires that every object has a unique definition. That rule would be broken if C++ allowed in-class definition of entities that needed to be stored in memory as objects.
A const variable has to be declared ...
Node.js check if file exists
How do i check the existence of a file ?
17 Answers
17
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jQuery Ajax POST example with PHP
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Basic usage of .ajax would look something like this:
HTML:
<form id="foo">
<label for="bar">A bar</label>
<input id="bar" name="bar" type="text" value="" />
<input type="submit" value="Send" />
</form>
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Passing $_POST values with cURL
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Should work fine.
$data = array('name' => 'Ross', 'php_master' => true);
// You can POST a file by prefixing with an @ (for <input type="file"> fields)
$data['file'] = '@/home/user/world.jpg';
$handle = curl_init($url);
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How to list the tables in a SQLite database file that was opened with ATTACH?
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The .tables, and .schema "helper" functions don't look into ATTACHed databases: they just query the SQLITE_MASTER table for the "main" database. Consequently, if you used
ATTACH some_file.db AS my_db;
then you need to do
SELECT name FROM my_db.sqlite_master WHERE type='tabl...