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How to rename with prefix/suffix?
How do I do mv original.filename new.original.filename without retyping the original filename?
9 Answers
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Standard deviation of a list
...ta list.
Sample std: You need to pass ddof (i.e. Delta Degrees of Freedom) set to 1, as in the following example:
numpy.std(< your-list >, ddof=1)
The divisor used in calculations is N - ddof, where N represents the number of elements. By default ddof is zero.
It calculates sampl...
Why can't my program compile under Windows 7 in French? [closed]
... You can get your proc back however with this (French) Windows 7 command:
set max-working-hours-a-week = 35
Repeat when you're stuck (but don't forget to lower the number each time!).
share
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Preferred method to store PHP arrays (json_encode vs serialize)
...k of at the moment.
A simple speed test to compare the two
<?php
ini_set('display_errors', 1);
error_reporting(E_ALL);
// Make a big, honkin test array
// You may need to adjust this depth to avoid memory limit errors
$testArray = fillArray(0, 5);
// Time json encoding
$start = microtime(tru...
Base64 encoding and decoding in client-side Javascript
...
Some browsers such as Firefox, Chrome, Safari, Opera and IE10+ can handle Base64 natively. Take a look at this Stackoverflow question. It's using btoa() and atob() functions.
For server-side JavaScript (Node), you can use Buffers to decode.
If y...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
从源代码剖析Mahout推荐引擎前言Mahout框架中cf.taste包实现了推荐算法引擎，它提供了一套完整的推荐算法工具集，同时规范了数据结构，并标准化了程序开发过程。应用推...前言
Mahout框架中cf.taste包实现了推荐算法引擎，它提供...
How to print a string in fixed width?
...n't shorten strings above 20 characters however. Use '%(name)20.20s' which sets 20 both as min and max string length!
– xjcl
Feb 21 at 21:44
add a comment
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How to see top processes sorted by actual memory usage?
I have a server with 12G of memory. A fragment of top is shown below:
12 Answers
12
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Python: Find in list
... whether something is a member of your list, you can convert the list to a set first and take advantage of constant time set lookup:
my_set = set(my_list)
if item in my_set: # much faster on average than using a list
# do something
Not going to be the correct solution in every case, but for ...
How does the MapReduce sort algorithm work?
...
Just guessing...
Given a huge set of data, you would partition the data into some chunks to be processed in parallel (perhaps by record number i.e. record 1 - 1000 = partition 1, and so on).
Assign / schedule each partition to a particular node in the cl...