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mqtt协议一般最大支持订阅几个主题？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...所有订阅的主题过滤器进行匹配。订阅数量巨大时，匹配算法效率（通常是Trie树）和CPU性能就变得至关重要。
最佳实践与建议使用主题通配符： 这是减少订阅数量最有效的方法。不要订阅 /house/room1/temperature、/house/room2/temperatu...
Is git good with binary files?
... For example for *.jpg files it can be difference in EXIF information, for PDF files it can be difference between their text representation (pdf2text or something like that).
HTH.
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What is the size of an enum in C?
...nt C Standard (C99): http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1256.pdf
6.7.2.2 Enumeration specifiers
[...]
Constraints
The expression that defines the value of an enumeration constant shall be an integer
constant expression that has a value representable as an int.
[...]
Eac...
Plot two histograms on single chart with matplotlib
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@GustavoBezerra, how to use plt.hist to produce one pdf file for each histogram? I loaded my data using pandas.read_csv and the file has 36 columns and 100 lines. So I'd like 100 pdf files.
– Sigur
Apr 15 '17 at 16:15
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Limit File Search Scope in Sublime Text 2
...*.jpeg", "*.png", "*.gif", "*.ttf", "*.tga", "*.dds", "*.ico", "*.eot", "*.pdf", "*.swf", "*.jar", "*.zip"],
"folder_exclude_patterns": [".svn", ".git", ".hg", "CVS"],
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Fast and responsive interactive charts/graphs: SVG, Canvas, other?
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I also found when we print to PDF a page with SVG graphics, the resulting PDF still contains a vector-based image, while if you print a page with Canvas graphics, the image in the resulting PDF file is rasterized.
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Postgresql: password authentication failed for user “postgres”
... From the Comprehensive manual, postgresql.org/files/documentation/pdf/12/postgresql-12-A4.pdf, section 20.5: "If no password has been set up for a user, the stored password is null and password authentication will always fail for that user.". Thus, since the installation doesn't ask for a p...
App Inventor 2 数学积木的9个隐藏用法：随机种子、位运算、取整陷阱，踩中...
...子，整个 App 的随机行为就可复现了。机器学习预处理、算法竞赛练习、课堂演示，这个块都是关键。
技巧3：round 的"银行家舍入"坑了多少人
App Inventor 2 的 round 用的是"四舍六入五成双"（Banker's Rounding），不...
提升大数据分析思想，拥抱大数据未来 - 资讯 - 清泛网 - 专注C/C++及内核技术
...能在最后一步获得想要的结果。事实上，在开始使用分析算法来对数据进行解读之前，数据科学家都要花费大量的时间进行数据清理，以保证数据的质量。”
良好的数据科学离不开高质量的数据资料和管控数据质量的必要步骤...
How to convert byte array to string and vice versa?
...o.
I was observing this problem when I was trying to create byte[] from a pdf file and then converting it to String and then taking the String as input and converting back to file.
So make sure your encoding and decoding logic is same as I did. I explicitly encoded the byte[] to Base64 and decode...