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Reorder levels of a factor without changing order of values
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some more, just for the record
## reorder is a base function
df$letters <- reorder(df$letters, new.order=letters[4:1])
library(gdata)
df$letters <- reorder.factor(df$letters, letters[4:1])
You may also find useful Relevel and combine_factor.
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Which equals operator (== vs ===) should be used in JavaScript comparisons?
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var1 == var2
When using == for JavaScript equality testing, some
funky conversions take place.
Moral of the story:
Use === unless you fully understand the
conversions that take place with ==.
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Does Git publicly expose my e-mail address?
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Millions of GitHub commit emails leaked
https://github.com/cirosantilli/all-github-commit-emails extracted from GitHub Archives https://www.githubarchive.org exports commit.
GitHub Archive gets data from GitHub's events API: https://developer.github.com/v3/activit...
create a trusted self-signed SSL cert for localhost (for use with Express/Node)
...server.js:
const express = require('express')
const app = express()
const https = require('https')
const fs = require('fs')
const port = 3000
app.get('/', (req, res) => {
res.send("IT'S WORKING!")
})
const httpsOptions = {
key: fs.readFileSync('./security/cert.key'),
cert: fs.readF...
Get output parameter value in ADO.NET
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static void Main(string[] args)
{
using( SqlConnection cn = new SqlConnection("server=(local);Database=Northwind;user id=sa;password=;"))
{
SqlCommand cmd = new SqlCommand("CustOrderOne", cn);
cmd.CommandType=CommandType.StoredProcedure ;
SqlParam...
Select where count of one field is greater than one
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I give an example up on Group By between two table in Sql:
Select cn.name,ct.name,count(ct.id) totalcity
from city ct left join country cn on ct.countryid = cn.id
Group By cn.name,ct.name
Having totalcity > 2
s...
基于PECL OAuth打造微博应用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...致代码如下：
<?php
session_start();
$request_token_url = 'https://open.t.qq.com/cgi-bin/request_token';
$authorize_url = 'https://open.t.qq.com/cgi-bin/authorize';
$access_token_url = 'https://open.t.qq.com/cgi-bin/access_token';
$oauth = new OAuth(
'YOUR_CONSUMER_KEY',...
How can I make nrepl-ritz-jack-in work remotely over TRAMP / Emacs
...m Here `Clojure - connection issue re-running cider-jack-in
Also see this https://devcenter.heroku.com/articles/debugging-clojure
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MFC AFX_WM_CREATETOOLBAR消息相关 - C/C++ - 清泛网 - 专注C/C++及内核技术
...指针。NULL 表示工具栏创建取消。
详细请参见：https://technet.microsoft.com/zh-cn/library/bb982948
定义：
BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWndEx)
ON_WM_CREATE()
ON_COMMAND(ID_WINDOW_MANAGER, &CMainFrame::OnWindowManager)
ON_COMMAND(ID_VIEW_CUSTOMIZE, &...
C# CultureInfo命名空间 - 更多技术 - 清泛网 - 专注C/C++及内核技术
C# CultureInfo命名空间using System.Globalization;详细请参考MSDN：https: msdn.microsoft.com zh-cn library system.globalization.cultureinfo.aspxusing System.Globalization;
详细请参考MSDN：https://msdn.microsoft.com/zh-cn/library/system.globalization.cultureinfo.aspxC# CultureInfo ...