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Is there a way to access an iteration-counter in Java's for-each loop?
...nly and never life long enough to reach the heap. So allocating them is as fast as e.g. allocating local variables.
– akuhn
Jun 12 '13 at 21:55
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When should I use the HashSet type?
...really limited and with unique members. On the other hand, they're really fast.
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MySQL - why not index every field?
...to indexes all the columns in a table. While this will make the table very fast to read from, it also becomes much slower to write to. Writing to a table that has every column indexed would involve putting the new record in that table and then putting each column's information in the its own index ...
How can I select rows with most recent timestamp for each key value?
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This solution is really fast.
– Ena
Aug 7 '18 at 15:50
Fast and eas...
Solr vs. ElasticSearch [closed]
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Apache Solr - Apache Solr offers Lucene's capabilities in an easy to use, fast search server with additional features like faceting, scalability and much more
Amazon ElastiCache - Amazon ElastiCache is a web service that makes it easy to deploy, operate, and scale an in-memory cache in the cloud.
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Rolling or sliding window iterator?
... ahead again in raw speed.
Access to individual items in the deque may be faster or slower than with lists or tuples. (Items near the beginning are faster, or items near the end if you use a negative index.) I put a sum(w) in the body of my loop; this plays to the deque's strength (iterating from o...
Is there a NumPy function to return the first index of something in an array?
...bviously do the same as above repeatedly, but there is a trick that may be faster. The following finds the indices of the first element of each subsequence:
>>> nonzero(r_[1, diff(t)[:-1]])
(array([0, 3, 5, 6, 7, 8]),)
Notice that it finds the beginning of both subsequence of 3s and bot...
Python Sets vs Lists
...t depends on what you are intending to do with it.
Sets are significantly faster when it comes to determining if an object is present in the set (as in x in s), but are slower than lists when it comes to iterating over their contents.
You can use the timeit module to see which is faster for your s...
How to change the playing speed of videos in HTML5?
...kRate attributes, accessible via the DOM. Example:
/* play video twice as fast */
document.querySelector('video').defaultPlaybackRate = 2.0;
document.querySelector('video').play();
/* now play three times as fast just for the heck of it */
document.querySelector('video').playbackRate = 3.0;
The ...
Why is there huge performance hit in 2048x2048 versus 2047x2047 array multiplication?
...multiplication benchmarking, as previously mentioned in
Why is MATLAB so fast in matrix multiplication?
10 Answers
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