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How to get indices of a sorted array in Python
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11 Answers
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ROW_NUMBER() in MySQL
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107
I want the row with the single highest col3 for each (col1, col2) pair.
That's a groupwis...
Get the last non-empty cell in a column in Google Sheets
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16 Answers
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Is it possible to use argsort in descending order?
...ail of the argsort to find the n highest elem>me m>nts:
avgDists.argsort()[::-1][:n]
Both m>me m>thods are O(n log n) in tim>me m> complexity, because the argsort call is the dominant term here. But the second approach has a nice advantage: it replaces an O(n) negation of the array with an O(1) slice. If you...
How to know if two arrays have the sam>me m> values
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function arraysEqual(_arr1, _arr2) {
if (!Array.isArray(_arr1) || ! Array.isArray(_arr2) || _arr1.length !== _arr2.length)
return false;
var arr1 = _arr1.concat().sort();
var arr2 = _arr2.concat().sort();
for (var i = 0; i &l...
How can I add a help m>me m>thod to a shell script?
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177
here's an example for bash:
usage="$(basenam>me m> "$0") [-h] [-s n] -- program to calculate the an...
quick random row selection in Postgres
...ith OFFSET, as in
SELECT myid FROM mytable OFFSET floor(random()*N) LIMIT 1;
The N is the number of rows in mytable. You may need to first do a SELECT COUNT(*) to figure out the value of N.
Update (by Antony Hatchkins)
You must use floor here:
SELECT myid FROM mytable OFFSET floor(random()*N) L...
How to remove the left part of a string?
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answered Apr 25 at 21:01
Xavier GuihotXavier Guihot
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SHA-1 fingerprint of keystore certificate
Is the m>me m>thod for getting a SHA-1 fingerprint the sam>me m> as the m>me m>thod of getting the a fingerprint? Previously, I was running this command:
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