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Speed up the loop operation in R
I have a big performance problem in R. I wrote a function that iterates over a data.frame object. It simply adds a new column to a data.frame and accumulates something. (simple operation). The data.frame has roughly 850K rows. My PC is still working (about 10h now) and I have no idea about the...
Sort an array in Java
I'm trying to make a program that consists of an array of 10 integers which all has a random value, so far so good.
17 Answ...
Listing all permutations of a string/integer
A common task in programming interviews (not from my experience of interviews though) is to take a string or an integer and list every possible permutation.
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Are static class variables possible in Python?
Is it possible to have static class variables or methods in Python? What syntax is required to do this?
21 Answers
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C# loop - break vs. continue
In a C# (feel free to answer for other languages) loop, what's the difference between break and continue as a means to leave the structure of the loop, and go to the next iteration?
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Counting inversions in an array
I'm designing an algorithm to do the following: Given array A[1... n] , for every i < j , find all inversion pairs such that A[i] > A[j] . I'm using merge sort and copying array A to array B and then comparing the two arrays, but I'm having a difficult time seeing how I can use this to find...
When is “i += x” different from “i = i + x” in Python?
I was told that += can have different effects than the standard notation of i = i + . Is there a case in which i += 1 would be different from i = i + 1 ?
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Why are variables “i” and “j” used for counters?
I know this might seem like an absolutely silly question to ask, yet I am too curious not to ask...
23 Answers
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setTimeout in for-loop does not print consecutive values [duplicate]
I have this script:
10 Answers
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Asynchronous Process inside a javascript for loop [duplicate]
I am running an event loop of the following form:
6 Answers
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