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How to select the row with the maximum value in each group

...ues of pt within each group: group[group[, .I[pt == max(pt)], by=Subject]$V1] # Subject pt Event # 1: 1 5 2 # 2: 2 17 2 # 3: 3 5 2 If you'd like just the first max value of pt: group[group[, .I[which.max(pt)], by=Subject]$V1] # Subject pt Event # 1: 1 ...
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How do I detect what .NET Framework versions and service packs are installed?

...---------- 1.0 HKLM\Software\Microsoft\.NETFramework\Policy\v1.0\3705 1.1 HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322\Install 2.0 HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\Install 3.0 HKLM\Software\Microsof...
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TCP 的那些事儿(下) - 更多技术 - 清泛网 - 专注C/C++及内核技术

...可以看到: 接收端LastByteRead指向了TCP缓冲区中读到的位置,NextByteExpected指向的地方是收到的连续包的最后一个位置,LastByteRcved指向的是收到的包的最后一个位置,我们可以看到中间有些数据还没有到达,所以有数据空白区。...
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常用Git命令汇总 - 开源 & Github - 清泛网 - 专注C/C++及内核技术

...not_master_branch分支push到远程的not_master_branch Tag git tag v1.0.0 [SHA] #打一个轻量级的tag,只是一个commit的指向引用,[SHA]是可选择值(某个commit的SHA),指定为哪个commit打tag,如果没写则直接为最后一个commit打tag git tag -a v1.0.0 -m "你...
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多媒体组件 · App Inventor 2 中文网

... 拍照完成后调用,文本参数 图像位址 是手机上找到图像位置的路径。 方法 拍照() 拍照,然后触发 拍摄完成 事件。 文件选择器 文件选择器组件是一个类似按钮的组件。当用户单击该组件时,将提示他们从系统中选...
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How to load assemblies in PowerShell?

...blog posts with numerous examples of ways to load assemblies in PowerShell v1, v2 and v3. The ways include: dynamically from a source file dynamically from an assembly using other code types, i.e. F# v1.0 How To Load .NET Assemblies In A PowerShell Session v2.0 Using CSharp (C#) code in PowerS...
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builder for HashMap

... Since Java 9 Map interface contains: Map.of(k1,v1, k2,v2, ..) Map.ofEntries(Map.entry(k1,v1), Map.entry(k2,v2), ..). Limitations of those factory methods are that they: can't hold nulls as keys and/or values (if you need to store nulls take a look at other answers) ...
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数据存储组件 · App Inventor 2 中文网

...存在,则创建该文件。查看 保存文件 了解有关文件写入位置的信息。 写入成功后,将触发 文件存储完毕 事件。 拷贝文件(源作用域,源文件名,目标作用域,目标文件名) 将第一个文件的内容复制到第二个文件。 删除(...
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Autoincrement VersionCode with gradle extra properties

...re accessible. This script will create a version number which looks like v1.3.4 (123) and build an apk file like AppName-v1.3.4.apk. Major version ⌄ ⌄ Build version v1.3.4 (123) Minor version ⌃|⌃ Patch version Major version: Has to be changed manually for bigger ch...
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Compare version numbers without using split function

...tring: static class Program { static void Main() { string v1 = "1.23.56.1487"; string v2 = "1.24.55.487"; var version1 = new Version(v1); var version2 = new Version(v2); var result = version1.CompareTo(version2); if (result > 0) ...