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How to select a CRAN mirror in R
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You should either get a window with a list of repositories or a text menu with some options. But if that is not appearing, you can always specify the mirror from where to download the packages yourself by using repos parameter. By doing that, R will not ask you anymore abou...
Is it OK to leave a channel open?
Is it OK to leave a Go channel open forever (never close the channel) if I never check for its state? Will it lead to memory leaks? Is the following code OK?
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process.env.NODE_ENV is undefined
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To set an environment variable in Windows:
SET NODE_ENV=development
on OS X or Linux:
export NODE_ENV=development
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Why can't strings be mutable in Java and .NET?
...ss authentication
which is necessary before the call
will be passed to OS. If String was
mutable it was possible somehow to
modify its content after the
authentication check before OS gets
request from program then it is
possible to request any file. So if
you have a right to open te...
How to Select Columns in Editors (Atom,Notepad++, Kate, VIM, Sublime, Textpad,etc) and IDEs (NetBean
...w keys to select columns without the mouse.
– Brian Koser
Nov 14 '11 at 16:08
+1 for quad-click-drag. I know Vim users...
Bash Script : what does #!/bin/bash mean? [duplicate]
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When bash is run as sh, it behaves differently (more POSIX-like) than when it is run as bash. Read the manual; it does cover that detail.
– Jonathan Leffler
Dec 14 '12 at 3:14
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Stop UIWebView from “bouncing” vertically?
....seems to work fine.
It'll be accepted to App Store as well.
Update: in iOS 5.x+ there's an easier way - UIWebView has scrollView property, so your code can look like this:
webView.scrollView.bounces = NO;
Same goes for WKWebView.
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那些年 O2O创业我踩了十个坑 - 资讯 - 清泛网 - 专注C/C++及内核技术
...线物流、站点，每个环节都进行了细化，把老的技术后台系统抛弃，又重新做了一套新的系统，我们的计划是做半年后，大约到2015年10月份，等数据上到一定的台阶，再去拉下轮新的融资。
可带给我们很大打击的是，我们行业...
How to show the last queries executed on MySQL?
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For those blessed with MySQL >= 5.1.12, you can control this option globally at runtime:
Execute SET GLOBAL log_output = 'TABLE';
Execute SET GLOBAL general_log = 'ON';
Take a look at the table mysql.general_log
If you prefe...
Android微信智能心跳方案 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...及时调整正确。
4.3.5 冗余Sync和心跳
在用户的一些主动操作以及联网状态改变时，增加冗余Sync和心跳，确保及时收到消息。
1、当用户点亮屏幕的时候，做一次心跳。
2、当微信切换到前台时，做一次Sync。
3、联网时重建信...