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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 ...
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...
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。...
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...
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...
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...
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)
...
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(...
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...
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)
...
