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pandas GroupBy columns with NaN (missing) values
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This is mentioned in the Missing Data section of the docs:
NA groups in GroupBy are automatically excluded. This behavior is consistent with R, for example.
One workaround is to use a placeholder before doing the groupby (e.g. -1):
In [...
How to format a JavaScript date
...custom-delimited date formats, you have to pull out the date (or time)
components from a DateTimeFormat object (which is part of the
ECMAScript Internationalization API), and then manually create a string
with the delimiters you want.
To do this, you can use DateTimeFormat#formatToParts. You could
d...
How to effectively work with multiple files in Vim
...p to any tab by using ngt, where n is the index of the tab (beginning with one). I think there's an option that displays the index of each tab near the file name, but I don't know what it is. If anyone knows, I'd love to hear it.
– void-pointer
Jan 13 '12 at 2:...
Clear the entire history stack and start a new activity on Android
...d not do that. :)
Edit:
As per @Ben Pearson's comment, for API <=10 now one can use IntentCompat class for the same. One can use IntentCompat.FLAG_ACTIVITY_CLEAR_TASK flag to clear task. So you can support pre API level 11 as well.
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Utils to read resource text file to String (Java) [closed]
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You can use the old Stupid Scanner trick oneliner to do that without any additional dependency like guava:
String text = new Scanner(AppropriateClass.class.getResourceAsStream("foo.txt"), "UTF-8").useDelimiter("\\A").next();
Guys, don't use 3rd party stuff unless...
How to create a fixed-size array of objects
...zed, because assumptions about the content of uninitialized references are one of the ways that programs in C (and some other languages) can become buggy. So, you need to explicitly ask for an [SKSpriteNode?] array that contains 64 nils:
var sprites = [SKSpriteNode?](repeating: nil, count: 64)
Th...
How to sort in-place using the merge sort algorithm?
...w. Compare with the standard merge algorithm given in most textbooks, this one exchanges the contents between the sorted sub-array and the working area. As the result, the previous working area contains the merged sorted elements, while the previous elements stored in the working area are moved to t...
How to assign the output of a command to a Makefile variable
... edited Jul 19 '18 at 1:32
OneCricketeer
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answered Jan 7 '10 at 11:49
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Select mySQL based only on month and year
I have a column in my mySQL DB that has some rows. One of this row is a DATE, like this: 2012-02-01
12 Answers
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What key shortcuts are to comment and uncomment code?
... edited Mar 20 '13 at 13:49
Soner Gönül
88.8k3030 gold badges176176 silver badges316316 bronze badges
answered Aug 22 '12 at 5:27
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