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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...
Scalar vs. primitive data type - are they the same thing?
...++ objects
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/1995/N0774.pdf
I'm curious about whether this refers to whether these items would have a value of 'scale'? - Such as counting numbers.
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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...
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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Saving images in Python at a very high quality
... Good point - DPI is not needed for vector formats like svg, pdf, eps
– spencerlyon2
Mar 12 '19 at 13:32
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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...
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...
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....
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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