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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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Is JavaScript an untyped language?
...ect
http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf
A more accurate designation for JavaScript would be implicitly typed, dynamically typed, or weakly/loosely typed (or some combination thereof), in that JavaScript uses type coercion in some cases which makes the type imp...
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...
站长投放广告绝对不做的事:Google Adsense和百度联盟广告违规分析 - 更多技...
...标题可以放置的文字只能是“赞助商链接”及“广告”（中文英文一样），其它的如“click here（单击此处）”、“support us（支持我们）”、“visit these link（访问这些链接）”或其他与内容无关、适用于任何广告的类似词语是完...
Why does C++11's lambda require “mutable” keyword for capture-by-value, by default?
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See open-std.org/JTC1/SC22/WG21/docs/papers/2008/n2651.pdf for some details.
– Johannes Schaub - litb
Mar 31 '11 at 16:08
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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....
盘点微软历史上9大失败软件产品！ - 创意 - 清泛网 - 专注C/C++及内核技术
...010年10月）：
该操作系统的设计初衷是尽量接近于桌面版本的Windows，微软按照电脑操作系统的模式来设计WM，以便能使得WM与电脑操作系统一模一样。新继任者Windows Phone操作系统出现后，Windows Mobile系列正式退出手机系统市场...
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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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...