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一分钟读懂低功耗蓝牙(BLE) MTU交换数据包 - 创客硬件开发 - 清泛IT社区，...
...p; BLE: 23 => 这就是为什么WIFI 可以用于传输视频，传统蓝牙(BT)可以传输音频，而低功耗蓝牙（BTLE 或者BLE）只能够传输控制数据的原因了。
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Expert R users, what's in your .Rprofile? [closed]
...ion("repos") # hard code the US repo for CRAN
r["CRAN"] <- "http://cran.us.r-project.org"
options(repos = r)
rm(r)
## put something this is your .Rprofile to customize the defaults
setHook(packageEvent("grDevices", "onLoad"),
function(...) grDevices::X11.options(width=8, heig...
What are “connecting characters” in Java identifiers?
...ist of connecting characters. These are characters used to connect words.
http://www.fileformat.info/info/unicode/category/Pc/list.htm
U+005F _ LOW LINE
U+203F ‿ UNDERTIE
U+2040 ⁀ CHARACTER TIE
U+2054 ⁔ INVERTED UNDERTIE
U+FE33 ︳ PRESENTATION FORM FOR VERTICAL LOW LINE
U+FE34 ︴ PRESENTAT...
Git is ignoring files that aren't in gitignore
...source> <COLON> <linenum> <COLON> <pattern> <HT> <pathname>
Or use the following command to print your .gitignore in user HOME and repository folder:
cat ~/.gitignore "$(git rev-parse --show-toplevel)"/.gitignore "$(git rev-parse --show-toplevel)"/.git/info/e...
分布式系统的事务处理 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...个ALF用的就是Paxos算法。我在Amazon的时候，看内部的分享视频时，设计者在内部的Principle Talk里说他参考了ZooKeeper的方法，但他用了另一种比ZooKeeper更易读的方式实现了这个算法。
简单说来，Paxos的目的是让整个集群的结点对某...
Placing an image to the top right corner - CSS
I need to display an image on the top-right corner of a div (the image is a "diagonal" ribbon) but keeping the current text contained in an internal div, like stuck to the top of it.
...
Remove data.frame row names when using xtable
OK, I admit this one is a bit uptight (read: "stupid"), and I assume it's quite easy too. I'm writing a report and I want to use xtable package for LaTeX table generation (note that memisc package does the job, but say I want to do this solely with xtable ).
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MFC OnEraseBkgnd浅析 - C/C++ - 清泛网 - 专注C/C++及内核技术
...由于刷除背景以后，在WM_PAINT未执行完成之前，windows已把视频卡的缓存输出到屏幕上了。
如何擦除之前的背景图片？
我明白问题所在了，你的问题是当窗口大小变化时，原来的背景没有被清除，造成图片重叠显示，你上面的...
How do I find Waldo with Mathematica?
... it
First, I'm filtering out all colours that aren't red
waldo = Import["http://www.findwaldo.com/fankit/graphics/IntlManOfLiterature/Scenes/DepartmentStore.jpg"];
red = Fold[ImageSubtract, #[[1]], Rest[#]] &@ColorSeparate[waldo];
Next, I'm calculating the correlation of this image with a si...
糯米推全景地图 让竞争对手们如何接招？ - 资讯 - 清泛网 - 专注C/C++及内核技术
...电商的从业人员曾经向我鼓吹一种理想：“买家可以通过视频跟踪货物的出仓、打包过程，防备出仓过程作假。”但当时的条件下，没人会真心投入大量的精力和财力那么做。后来，我也曾经畅想过餐饮外卖O2O的全景模式，顾客...