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What is the purpose of setting a key in data.table?
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Minor update: Please refer to the new HTML vignettes as well. This issue highlights the other vignettes that we plan to.
I've updated this answer again (Feb 2016) in light of the new on= feature that allows ad-hoc joins as well. See history for earlier (ou...
How to add a custom right-click menu to a webpage?
...t-click behavior - it depends on application that you're developing.
JSFIDDLE
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Using PowerShell to write a file in UTF-8 without the BOM
...ems to work:
$MyRawString = Get-Content -Raw $MyPath
$Utf8NoBomEncoding = New-Object System.Text.UTF8Encoding $False
[System.IO.File]::WriteAllLines($MyPath, $MyRawString, $Utf8NoBomEncoding)
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How to see which commits in one branch aren't in the other?
... my big diff is to squash all 30 of my commits into one, patch that onto a new feature branch, soft reset the patch commit, then use git gui to add pieces file by file, chunk by chunk, or line by line. Once I get one sub-feature, I can commit what I've added then check out a new branch, add some mor...
Why does datetime.datetime.utcnow() not contain timezone information?
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now you can change timezones
print(u.astimezone(pytz.timezone("America/New_York")))
To get the current time in a given timezone, you could pass tzinfo to datetime.now() directly:
#!/usr/bin/env python
from datetime import datetime
import pytz # $ pip install pytz
print(datetime.now(pytz.time...
Windows can't find the file on subprocess.call()
... can be a security risk if you're passing arguments that may come from outside your program. To make subprocess nonetheless able to find the correct executable, you can use shutil.which. Suppose the executable in your PATH is named frob:
subprocess.call([shutil.which('frob'), arg1, arg2])
(This w...
Check if a value exists in pandas dataframe index
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with DataFrame: df_data
>>> df_data
id name value
0 a ampha 1
1 b beta 2
2 c ce 3
I tried:
>>> getattr(df_data, 'value').isin([1]).any()
True
>>> getattr(df_data, 'value').isin(['1']).any()
True
but:
>>&...
Colors in JavaScript console
...6px hsl(140.4, 100%, 50%), 45px 27px hsl(145.8, 100%, 50%), 46px 28px hsl(151.2, 100%, 50%), 47px 29px hsl(156.6, 100%, 50%), 48px 30px hsl(162, 100%, 50%), 49px 31px hsl(167.4, 100%, 50%), 50px 32px hsl(172.8, 100%, 50%), 51px 33px hsl(178.2, 100%, 50%), 52px 34px hsl(183.6, 100%, 50%), 53px 35px h...
What's the most efficient way to erase duplicates and sort a vector?
...ly sorting the vector is always more efficient than using a set. I added a new more efficient method, using an unordered_set.
Keep in mind that the unordered_set method only works if you have a good hash function for the type you need uniqued and sorted. For ints, this is easy! (The standard librar...
How to make the tab character 4 spaces instead of 8 spaces in nano?
... the home dir and that worked. This are the only 3 lines I included in the new .nanorc for anyone interested: set nowrap, set tabsize 4 and set tabstospaces
– Alex
Jun 1 '15 at 13:19
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