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What is the fastest way to get the value of π?
...t π I know of is the one with the digits hard coded. Looking at Pi and Pi[PDF], there are a lot of formulae.
Here is a method that converges quickly — about 14 digits per iteration. PiFast, the current fastest application, uses this formula with the FFT. I'll just write the formula, since the co...
动态追踪（Dynamic Tracing）技术漫谈 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...内核模块。Oracle 也有在它自己的 Oracle Linux 操作系统发行版当中开始针对 Linux 内核进行 DTrace 移植。不过 Oracle 的移植工作好像一直没有多少起色，毕竟 Linux 内核并不是 Oracle 控制的，而 DTrace 是需要和操作系统内核紧密集成的...
See what process is using a file in Mac OS X
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lsof | grep myfilename worked for me. I've got a PDF file in my Trash that the system claims is in use. Weirdly lsof claims it's in use by Preview but Preview doesn't seem to be running (eg when I command-tab through the running apps) but Activity Monitor does show it to b...
Convert data.frame column format from character to factor
...tml
R Reference card: http://cran.r-project.org/doc/contrib/Short-refcard.pdf
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Object-orientation in C
...on, ownership, exceptions, contracts and closures. There is a draft paper (PDF) that describes it.
Exception in C is a C89 implementation of the TRY-CATCH-FINALLY found in other OO languages. It comes with a testsuite and some examples.
Both by Laurent Deniau, which is working a lot on OOP in C....
What algorithms compute directions from point A to point B on a map?
...roven for correctness:
http://algo2.iti.uka.de/schultes/hwy/schultes_diss.pdf
Here's a google tech talk on the subject:
http://www.youtube.com/watch?v=-0ErpE8tQbw
Here's a implementation of the highway-hierarchies algorithm as discussed by schultes (currently in berlin only, I'm writing the inte...
Is the order of elements in a JSON list preserved?
...rded passage in ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf 'The JSON syntax does not define any specific meaning to the ordering of the values. However, the JSON array structure is often used in situations where there is some semantics to the ordering. '
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linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...录结构
/usr/sbin/squid –z
2．设置Squid错误提示信息为中文
在Squid的主配置文件/etc/squid/squid.conf中添加下
列语句，并使用命令“/etc/init.d/squid reload”重新载
入配置文件
error_directory /usr/share/squid/errors/Simplify_Chinese
2.5...
How does the algorithm to color the song list in iTunes 11 work? [closed]
... to the (median cut quantization algorithm)[leptonica.com/papers/mediancut.pdf]. I just implemented this in python in about 2 hours just form the description in the paper, and prefer it to my implementation of Seth's algorithm above. I like the results a bit better, but most importantly it is quite ...
BLE（一）概述&工作流程&常见问题 - 创客硬件开发 - 清泛IT社区，...
...，即Bluetooth，是斯堪的纳维亚语中 Blåtand / Blåtann 的英化版本。该词是十世纪的一位国王Harald Bluetooth的绰号，相传他将纷争不断的丹麦部落统一为一个王国，并引入了基督教。蓝牙技术开发者Jim Kardach于1997年提出用Bluetooth这个...