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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...法云（技术纯粹一些，还支持TCP长连接），阿里云（企业版收费，可免费试用，步骤复杂），华为云（暂未研究）。
国外的平台：
HiveMQ公共测试：https://www.mqtt-dashboard.com/
EMQX：broker.emqx.io
4、MQTT测试客户端：
不用挑...
How do I handle newlines in JSON?
...ion, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf:
A string is a sequence of Unicode code points wrapped with quotation marks
(U+0022). All characters may be placed within the quotation marks except for the
characters that must be escaped: quotation mark (U+0...
How to reorder data.table columns (without copying)
...this in the first item here: datatable.r-forge.r-project.org/datatable-faq.pdf
– Frank
Dec 2 '15 at 21:51
...
Replacement for “rename” in dplyr
... function in dplyr (yet): http://cran.rstudio.org/web/packages/dplyr/dplyr.pdf
The function below works (almost) the same if you don't want to load both plyr and dplyr
rename <- function(dat, oldnames, newnames) {
datnames <- colnames(dat)
datnames[which(datnames %in% oldnames)] <- ne...
Is there something like RStudio for Python? [closed]
...ipt (a .py file including only the source code)
static html (and therefore pdf as well)
You can even share your notebooks online with others using the nbviewer service, where people publish whole books. Furthermore, GitHub renders your .ipynb files. You can publish your Jupyter Notebooks as reprod...
How to remove outliers from a dataset
...ed "outliers"!): https://cran.r-project.org/web/packages/outliers/outliers.pdf
if you go through it you see different ways of removing outliers and among them I found rm.outlier most convenient one to use and as it says in the link above:
"If the outlier is detected and confirmed by statistical tes...
Visual Studio 2012 Web Publish doesn't copy files
...ing uploaded when I published my project.
The file types in question were .pdf files and .rtf.
The reason this happened was because these file extensions were not recognized as requiring publishing by Visual Studio. Luckily this can be changed in Visual Studio.
Select the file(s) that aren’t being...
大数据：用数据指导APP运营 - 资讯 - 清泛网 - 专注C/C++及内核技术
...性社区平台，其效果几乎也可以无视，而如果换成一款Q版小游戏，或许效果就很好。
成本数据和收益数据，则会从不同层面反映出运营的效果。
在这里插一句，千万不要相信网上流传的各种《XX高管教你不花钱做运营》这种...
Difference between Pig and Hive? Why have both? [closed]
...ing Cloudera's Hadoop VM. Have read Google's paper on Map-Reduce and GFS ( PDF link ).
19 Answers
...
How do I test if a string is empty in Objective-C?
...MENT CHARACTER) which behave likewise. You may get the latter when parsing PDF text.
– fzwo
Jan 8 '14 at 14:12
...