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Omit rows containing specific column of NA
...dy? Take all columns that do not have NAs at all.
– Léo Léopold Hertz 준영
Jul 18 '17 at 15:33
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Resolve absolute path from relative path and/or file name
...ou need to support both relative and absolute paths, you can make use of Frédéric Ménez's solution: temporarily change the current working directory.
Here's an example that'll demonstrate each of these techniques:
@echo off
echo %%~dp0 is "%~dp0"
echo %%0 is "%0"
echo %%~dpnx0 is "%~dpnx0"
ech...
How to create circle with Bézier curves?
... a circle radius. There also exists an engine that can create a path from Bézier curve points.
10 Answers
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How to get a random number in Ruby
...ust need a random float, just call rand with no arguments.
As Marc-André Lafortune mentions in his answer below (go upvote it), Ruby 1.9.2 has its own Random class (that Marc-André himself helped to debug, hence the 1.9.2 target for that feature).
For instance, in this game where you need to ...
Request is not available in this context
... answered Apr 4 '14 at 9:17
FrédéricFrédéric
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postgres: upgrade a user to be a superuser?
...sterweily You can do \du to list all users/roles.
– XåpplI'-I0llwlg'I -
Apr 6 '14 at 23:38
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Why does !{}[true] evaluate to true in JavaScript?
... answered Oct 31 '13 at 9:43
Frédéric HamidiFrédéric Hamidi
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那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...作，是有大把的机会学习的，而且也不限于“拿公司的软硬件做实验”。比如思考行业会有什么发展并根据现实比对，观察每个职位的人都在做什么，做得好的同事有怎样的方法论，找外国同事聊天练习口语之类。这些机会你抓...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...现简单，但是因存在cache而缺乏灵活性；一般基于商用的硬件F5、NetScaler或者开源的软负载lvs在4层做分发，当然会采用做冗余(比如lvs+keepalived)的考虑，采取主备方式。
4层分发到业务集群上后，会经过web服务器如nginx或者HAProxy在...
How to install an npm package from GitHub directly?
... Global installs seem to be working in npm 3.3.8.
– XåpplI'-I0llwlg'I -
Oct 23 '15 at 7:34
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