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App Inventor 2 拓展参考文档 · App Inventor 2 中文网
...创建AI2组件对象
【Hash】文件Hash拓展：文件哈希计算和 Base64 编码文件，sha256、sha512 哈希
【向量计算】VectorArithmetic 拓展：计算两个向量相加的结果向量
【手机管理】App Inventor 2 TaifunTM 拓展：获取本机手机号码
【电池管...
How to empty a list?
...s what I needed to do. I was taking in data and wanted to create sub lists based on a condition and put the sub lists into a master list. Naturally when I would use any of the delete methods it would delete the sub list and the list I was appending in the master list. Mitenka's suggestion was exactl...
Peak signal detection in realtime timeseries data
... with an algorithm that works very well for these types of datasets. It is based on the principle of dispersion: if a new datapoint is a given x number of standard deviations away from some moving mean, the algorithm signals (also called z-score). The algorithm is very robust because it constructs a...
App Inventor 2 图片云端保存及访问的开发思路 · App Inventor 2 中文网
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图片上传云端保存
图片Base64化，保存“网络微数据库”
使用“Web客户端”组件上传图片到三方图床
自己搭建私有图片服务器
云端图片访问
使用“Web浏览器”组件，访问...
What's the recommended way to extend AngularJS controllers?
...extend (or $.extend) actually means extending the $scope only, but if your base controller also defines some properties (e.g. this.myVar=5), you only have access to this.myVar in the extending controller when using angular.extend
– schellmax
Dec 23 '14 at 9:46
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How do you test functions and closures for equality?
...safeBitCast between types of different sizes. The idea is to build a event based system but the removeEventListener method should be able to check the function pointers.
– freezing_
Jan 28 '15 at 21:19
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Plotting time in Python with Matplotlib
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How do you convert a DataTable into a generic list?
... = new List<Employee>();
//Maintaining DataTable on ViewState
//For Demo only
DataTable dt = ViewState["CurrentEmp"] as DataTable;
//read data from DataTable
//using lamdaexpression
emp = (from DataRow row in dt.Rows
select new Employee
{
_FirstName = row["FirstName"].ToStr...
Is there a generator version of `string.split()` in Python?
... rest when you find it, then you have the justification to use a generator based split instead of the built-in solution.
– jgomo3
Feb 17 at 15:09
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Javascript sort array by two fields
... item", price: "0", priority: 2, reviews: 249, rating: 0.5 } ...
];
live demo: http://gregtaff.com/misc/multi_field_sort/
EDIT: Fixed issue with Chrome.
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