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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 can I put strings in an array, split by new line?
I have a string with line breaks in my database. I want to convert that string into an array, and for every new line, jump one index place in the array.
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Profiling Django
...l show you what queries are executed on each page and how much time they take. It's a really useful, powerful and easy to use tool.
Also, read recommendations about Django performance in Database access optimization from the documentation.
And Django performance tips by
Jacob Kaplan-Moss.
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Why cast unused return values to void?
...ny reason for casting an unused return value to void, or am I right in thinking it's a complete waste of time?
9 Answers
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Drop unused factor levels in a subsetted data frame
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hatmatrixhatmatrix
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How can I close a buffer without closing the window?
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There's a script on the Vim wiki to do this. I don't think there is a builtin that does what you want.
The latest version of vim-bufkill is on github.
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How to set timeout on python's socket recv method?
I need to set timeout on python's socket recv method. How to do it?
10 Answers
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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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Hibernate: “Field 'id' doesn't have a default value”
I'm facing what I think is a simple problem with Hibernate, but can't solve it (Hibernate forums being unreachable certainly doesn't help).
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