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What does ~~ (“double tilde”) do in Javascript?
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251
It removes everything after the decimal point because the bitwise operators implicitly convert ...
Automatically expanding an R factor into a collection of 1/0 indicator variables for every factor le
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Jaap
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answered Feb 19 '11 at 3:50
Greg SnowGreg Sno...
What is in your Mathematica tool bag? [closed]
...ne liner:
SelectEquivalents[hamlst,
#[[;; 3]] &,
#[[{4, 5}]] -> (Complex @@ #[[6 ;;]]) &,
{#1, SparseArray[#2]} &]
Honestly, this is my Swiss Army Knife, and it makes complex things very simple. Most of my other tools are somewhat domain specific, so I'll prob...
mongo - couldn't connect to server 127.0.0.1:27017
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edited Mar 29 '18 at 15:24
Bugs
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answered Nov...
How to design a product table for many kinds of product where each product has many parameters
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edited May 14 '19 at 20:52
answered Mar 30 '09 at 2:41
Bi...
Initialise a list to a specific length in Python [duplicate]
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358
If the "default value" you want is immutable, @eduffy's suggestion, e.g. [0]*10, is good enough...
Calendar Recurring/Repeating Events - Best Storage Method
...amp, and repeat_interval an amount in seconds between intervals (432000 is 5 days).
repeat_interval_1 goes with repeat_start of the ID 1. So if I have an event that repeats every Tuesday and every Thursday, the repeat_interval would be 604800 (7 days), and there would be 2 repeat_starts and 2 repe...
How to check whether a string is Base64 encoded or not
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256
You can use the following regular expression to check if a string is base64 encoded or not:
^(...
Rails find record with zero has_many records associated [duplicate]
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Bah, found it here: https://stackoverflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
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