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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...
Only read selected columns
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157
Say the data are in file data.txt, you can use the colClasses argument of read.table() to skip...
Drawing a dot on HTML5 canvas [duplicate]
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143
For performance reasons, don't draw a circle if you can avoid it. Just draw a rectangle with a...
Extract value of attribute node via XPath
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//Parent[@id='1']/Children/child/@name
Your original child[@name] means an element child which has an attribute name. You want child/@name.
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How can I get file extensions with JavaScript?
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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...
Best way to parseDouble with comma as decimal separator?
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10 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...
How to initialize a two-dimensional array in Python?
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for i in range (0, 10): \
new = [] \ can be replaced } this too
for j in range (0, 10): } with a list /
new.append(foo) / comprehension /
twod_li...