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How to get the current loop index when using Iterator?
I am using an Iterator to iterate through a collection
and I want to get the current element's index.
12 Answers
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
From a data frame, is there a easy way to aggregate ( sum , mean , max et c) multiple variables simultaneously?
8 Answer...
Elegant way to search for UTF-8 files with BOM?
For debugging purposes, I need to recursively search a directory for all files which start with a UTF-8 byte order mark (BOM). My current solution is a simple shell script:
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Remove all whitespaces from NSString
I've been trying to get rid of the white spaces in an NSString , but none of the methods I've tried worked.
11 Answers
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Check if a class is derived from a generic class
I have a generic class in my project with derived classes.
16 Answers
16
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How can I replace a newline (\n) using sed?
How can I replace a newline (" \n ") with a space (" ") using the sed command?
42 Answers
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What does %>% mean in R [duplicate]
I am following this example, the server.R , file is here .
1 Answer
1
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几个有趣的Javascript Hack - 创意 - 清泛网 - 专注C/C++及内核技术
几个有趣的Javascript Hack在网上看到几个有意思的Javascript代码，和大家分享一下。1. 直接在浏览器中编辑网页内容javascript：document.body.contentEditable=&#39...在网上看到几个有意思的Javascript代码，和大家分享一下。
1. 直接在浏览器中...
Linux Shell脚本参数的获取方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...exit xx, 函数return xx）一般0成功,1失败
#!/bin/sh
echo 'file name:' $0
echo 'param num: ' $#
if [ $# -gt 1 ]; then
echo 'the second param:' $2
fi
./param.sh
file name: ./param.sh
param num: 0
./param.sh a
file name: ./param.sh
param num: 1
./param.sh a b
file name: ....
Linux bpftrace学习笔记（持续更新） - 操作系统(内核) - 清泛网 - 专注IT技能提升
Linux bpftrace学习笔记（持续更新）Linux-bpftrace-notes图：BPF性能工具及其可见性bpftrace安装请参考：bpftrace-install。1、查看程序在打开哪些文件： bpftrace -e & 39;tracepoint:syscalls:sys_enter_open { printf("%s %s n
图：BPF性能工具及其可见性
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