大约有 40,000 项符合查询结果（耗时：0.0354秒） [XML]
Sleeping in a batch file
...
REM GET ENDING SECOND
FOR /F "TOKENS=1-3 DELIMS=:." %%A IN ("%TIME%") DO SET /A H=%%A, M=1%%B%%100, S=1%%C%%100, ENDING=(H*60+M)*60+S+%1
REM WAIT FOR SUCH A SECOND
:WAIT
FOR /F "TOKENS=1-3 DELIMS=:." %%A IN ("%TIME%") DO SET /A H=%%A, M=1%%B%%100, S=1%%C%%100, CURRENT=(H*60+M)*60+S
IF %CURRENT% L...
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
...
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...
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...
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
|...
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...
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
...
How to split a string into an array of characters in Python?
I've tried to look around the web for answers to splitting a string into an array of characters but I can't seem to find a simple method
...
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 ...