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How to get execution time in rails console?
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timing = Benchmark.measure { Post.all }
The various attributes of the object returned (Benchm...
What does this square bracket and parenthesis bracket notation mean [first1,last1)?
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4 Answers
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How to split a sequence into two pieces by predicate?
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By using partition method:
scala> List(1,2,3,4).partition(x => x % 2 == 0)
res0: (List[Int], List[Int]) = (List(2, 4),List(1, 3))
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Convert a row of a data frame to vector
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answered Jan 23 '13 at 16:42
Ben BolkerBen Bolker
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How to get subarray from array?
I have var ar = [1, 2, 3, 4, 5] and want some function getSubarray(array, fromIndex, toIndex) , that result of call getSubarray(ar, 1, 3) is new array [2, 3, 4] .
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How can I get a Bootstrap column to span multiple rows?
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<div class="row">
<div class="col-md-4">
<div class="well">1
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<div class...
Regex how to match an optional character
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How to get the last N rows of a pandas DataFrame?
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Don't forget DataFrame.tail! e.g. df1.tail(10)
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Adding a new array element to a JSON object
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JSON is just a notation; to make the change you want parse it so you can apply the changes to a...