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Algorithm to return all combinations of k elements from n
... The second place, with one change {1,3,4} has one change but accounts for more change since it's in the second place (proportional to the number of elements in the original set).
The method I've described is a deconstruction, as it seems, from set to the index, we need to do the reverse – which ...
Is this a “good enough” random algorithm; why isn't it used if it's faster?
...uencies are generally higher at the lower values while Math.random() has a more uniform distribution. Here's a SSCCE which shows that:
package com.stackoverflow.q14491966;
import java.util.Arrays;
public class Test {
public static void main(String[] args) throws Exception {
QuickRand...
What is the purpose of backbone.js?
...om/#search?q=backbone.js
Some pros that I discovered with Backbone:
No more Javascript Spaghetti: code is organized and broken down into semantically meaningful .js files which are later combined using JAMMIT
No more jQuery.data(bla, bla): no need to store data in DOM, store data in models inste...
Should a Netflix or Twitter-style web service use REST or SOAP? [closed]
...inevitable that this day would come and I am sure we are going to see many more questions like this in the coming months.
The warning signs
You are absolutely correct, it does take longer to build RESTful clients than SOAP clients. The SOAP toolkits take away lots of boilerplate code and make clie...
Encrypting & Decrypting a String in C# [duplicate]
..., then authentication may not even be necessary.
If you require something more complex, and which offers authenticated encryption, check out this post for an implementation.
Here's the code:
using System;
using System.Text;
using System.Security.Cryptography;
using System.IO;
using System.Linq;
...
Listing only directories in UNIX
...that's pretty nifty, I always used to us ls -al | grep '^d' - this is much more succinct.
– paxdiablo
Sep 8 '10 at 11:48
43
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DynamoDB vs MongoDB NoSQL [closed]
...lan to store from about 500k records per month in the first year and maybe more for the next years this is a vertical application so there's no need to use a database for this, that's the reason why I decided to choose a noSQL data storage.
...
How to form tuple column from two columns in Pandas
...
This method list(zip(df.lat, df.long)) in 124ms is much more efficient than df[['lat', 'long']].apply(tuple, axis=1) in 14.2 s for 900k rows. The ratio is more than 100.
– Pengju Zhao
Aug 2 '17 at 4:21
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Is there a Max function in SQL Server that takes two values like Math.Max in .NET?
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Find and restore a deleted file in a Git repository
.... I delete a file and commit that change. I continue working and make some more commits. Then, I find I need to restore that file.
...