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How to delete from select in MySQL?
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210
SELECT (sub)queries return result sets. So you need to use IN, not = in your WHERE clause.
Add...
Split comma-separated strings in a column into separate rows
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81
This old question frequently is being used as dupe target (tagged with r-faq). As of today, it h...
C Macro definition to determine big endian or little endian machine?
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19 Answers
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Which characters need to be escaped when using Bash?
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291
There are two easy and safe rules which work not only in sh but also bash.
1. Put the whole str...
What is the best Battleship AI?
... games per match. Doing 50 games is just flipping a coin. I needed to do 1000 games to get any reasonable distinction between test algorithms.
Download Dreadnought 1.2.
Strategies:
keep track of all possible positions for ships that have >0 hits. The list never gets bigger than ~30K so it ...
How to get first element in a list of tuples?
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12 Answers
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Only read selected columns
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Say the data are in file data.txt, you can use the colClasses argument of read.table() to skip...
Can C++ code be valid in both C++03 and C++11 but do different things?
... possible for C++ code to conform to both the C++03 standard and the C++11 standard, but do different things depending on under which standard it is being compiled?
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What are all the uses of an underscore in Scala?
...K[_],T](a: K[T])
Ignored variables
val _ = 5
Ignored parameters
List(1, 2, 3) foreach { _ => println("Hi") }
Ignored names of self types
trait MySeq { _: Seq[_] => }
Wildcard patterns
Some(5) match { case Some(_) => println("Yes") }
Wildcard patterns in interpolations
"abc" m...
Is MATLAB OOP slow or am I doing something wrong?
...t; call_nops
Computer: PCWIN Release: 2009b
Calling each function/method 100000 times
nop() function: 0.02261 sec 0.23 usec per call
nop1-5() functions: 0.02182 sec 0.22 usec per call
nop() subfunction: 0.02244 sec 0.22 usec per call
@()[] anonymous f...