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What is the difference between map and flatMap and a good use case for each?
... how it is processing the data.
Below is the sample data file.
hadoop is fast
hive is sql on hdfs
spark is superfast
spark is awesome
The above file will be parsed using map and flatMap.
Using map
>>> wc = data.map(lambda line:line.split(" "));
>>> wc.collect()
[u'hadoop is f...
Optimise PostgreSQL for fast testing
...iguration
When testing, you can configure your server for non-durable but faster operation.
This is one of the only acceptable uses for the fsync=off setting in PostgreSQL. This setting pretty much tells PostgreSQL not to bother with ordered writes or any of that other nasty data-integrity-protect...
Fast stable sorting algorithm implementation in javascript
... For anyone who wants an in-place, drop-in solution that's much faster than this implementation, check out my answer.
– Patrick Roberts
Sep 19 '17 at 21:26
...
oh-my-zsh slow, but only for certain Git repo
...lder makes things slow, like the rake folder does for rails apps? zsh is fast now, and I do not need the GIT zsh plugin anyway. Thanks!
– mblaettermann
Dec 31 '15 at 22:01
...
Statistics: combinations in Python
...
This would probably be fast in Haskell, but not Python unfortunately. It's actually quite slow compared to many of the other answers, e.g. @Alex Martelli, J.F. Sebastian, and my own.
– Todd Owen
Oct 1 '13 at 6...
A quick and easy way to join array elements with a separator (the opposite of split) in Java [duplic
...
A fast and simple solution without any 3rd party includes.
public static String strJoin(String[] aArr, String sSep) {
StringBuilder sbStr = new StringBuilder();
for (int i = 0, il = aArr.length; i < il; i++) {
...
Analyze audio using Fast Fourier Transform
...https%3a%2f%2fstackoverflow.com%2fquestions%2f604453%2fanalyze-audio-using-fast-fourier-transform%23new-answer', 'question_page');
}
);
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Name...
Haskell: Lists, Arrays, Vectors, Sequences
...in memory are not laid out next to each other. So, in C++ std::vector has faster "snoc" (putting objects at the end) than any pure linked list data structure I know of, although this is not a persistant data structure so less friendly than Haskell's lists.
The third problem with lists is that they...
Moving average or running mean
...
For a short, fast solution that does the whole thing in one loop, without dependencies, the code below works great.
mylist = [1, 2, 3, 4, 5, 6, 7]
N = 3
cumsum, moving_aves = [0], []
for i, x in enumerate(mylist, 1):
cumsum.append(c...
Why does changing 0.1f to 0 slow down performance by 10x?
...N);
Then the version with 0 is no longer 10x slower and actually becomes faster. (This requires that the code be compiled with SSE enabled.)
This means that rather than using these weird lower precision almost-zero values, we just round to zero instead.
Timings: Core i7 920 @ 3.5 GHz:
// Don't...