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How to implement a queue with three stacks?
...SUMMARY
O(1) algorithm is known for 6 stacks
O(1) algorithm is known for 3 stacks, but using lazy evaluation which in practice corresponds to having extra internal data structures, so it does not constitute a solution
People near Sedgewick have confirmed they are not aware of a 3-stack solution wi...
How do I replace NA values with zeros in an R dataframe?
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See my comment in @gsk3 answer. A simple example:
> m <- matrix(sample(c(NA, 1:10), 100, replace = TRUE), 10)
> d <- as.data.frame(m)
V1 V2 V3 V4 V5 V6 V7 V8 V9 V10
1 4 3 NA 3 7 6 6 10 6 5
2 9 8 9 5 10 NA 2 1 7 ...
Java lib or app to convert CSV to XML file? [closed]
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edited Feb 7 '13 at 10:36
CloudyMarble
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Convert a PHP object to an associative array
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32 Answers
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Split list into multiple lists with fixed number of elements
...an iterator, but you can convert the result to a list,
scala> List(1,2,3,4,5,6,"seven").grouped(4).toList
res0: List[List[Any]] = List(List(1, 2, 3, 4), List(5, 6, seven))
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How to get execution time in rails console?
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3 Answers
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How to compare two floating point numbers in Bash?
...s in scientific format, provided a capital letter E is employed, e.g. num1=3.44E6
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python pandas dataframe to dictionary
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answered Sep 9 '13 at 9:55
jorisjoris
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Getting parts of a URL (Regex)
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153
A single regex to parse and breakup a
full URL including query parameters
and anchors e.g...
How to extend an existing JavaScript array with another array, without creating a new array
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1553
The .push method can take multiple arguments. You can use the spread operator to pass all the el...