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Boolean operators && and ||
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The shorter ones are vectorized, meaning they can return a vector, like this:
((-2:2) >= 0) & ((-2:2) <= 0)
# [1] FALSE FALSE TRUE FALSE FALSE
The longer form evaluates left to right examining only the first element of each...
PreparedStatement IN clause alternatives?
...supported for multiple values due to SQL injection attack security issues: One ? placeholder represents one value, rather than a list of values.
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Is there a way to use two CSS3 box shadows on one element?
... Also mention that the first declared shadow is on to of the following one(s) jsfiddle.net/webtiki/s9pkj
– web-tiki
Jul 14 '14 at 14:20
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What are the benefits of learning Vim? [closed]
...g
vi is guaranteed to exist on all Unix systems and exists on most Linux ones as well. That kind of broad coverage makes learning it worth it.
It's much quicker to use vi for a sudo edit:
$ sudo vi
Also, GMail uses vi-ish commands for selecting & moving emails around!
You don't have to be...
I want to remove double quotes from a String
...double quotes. you can replace this with " to only match double quotes.
+: one or more quotes, chars, as defined by the preceding char-class (optional)
g: the global flag. This tells JS to apply the regex to the entire string. If you omit this, you'll only replace a single char.
If you're trying t...
Convert JSON String to Pretty Print JSON output using Jackson
... it should be possible to configure it to use indentation. Although to be honest, I am not sure why you even need to indent it for response.
– StaxMan
Jan 26 '13 at 3:57
33
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Scala how can I count the number of occurrences in a list
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A somewhat cleaner version of one of the other answers is:
val s = Seq("apple", "oranges", "apple", "banana", "apple", "oranges", "oranges")
s.groupBy(identity).mapValues(_.size)
giving a Map with a count for each item in the original sequence:
Map(b...
Import multiple csv files into pandas and concatenate into one DataFrame
...d several csv files from a directory into pandas and concatenate them into one big DataFrame. I have not been able to figure it out though. Here is what I have so far:
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How to create a tuple with only one element
...Empty tuples are constructed by an empty pair of parentheses; a tuple with one item is constructed by following a value with a comma (it is not sufficient to enclose a single value in parentheses). Ugly, but effective.
If you truly hate the trailing comma syntax, a workaround is to pass a list to ...
What's the best way to iterate over two or more containers simultaneously
...tage of your indices implementation in comparison to boost counting_range? One could simply use boost::counting_range(size_t(0), containerA.size())
– SebastianK
Nov 6 '14 at 13:11
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