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On localhost, how do I pick a free port number?
I'm trying to play with inter-process communication and since I could not figure out how to use named pipes under Windows I thought I'll use network sockets. Everything happens locally. The server is able to launch slaves in a separate process and listens on some port. The slaves do their work and s...
What is the best way to count “find” results?
My current solution would be find <expr> -exec printf '.' \; | wc -c , but this takes far too long when there are more than 10000 results. Is there no faster/better way to do this?
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Confusion between factor levels and factor labels
There seems to be a difference between levels and labels of a factor in R.
Up to now, I always thought that levels were the 'real' name of factor levels, and labels were the names used for output (such as tables and plots). Obviously, this is not the case, as the following example shows:
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Installing Numpy on 64bit Windows 7 with Python 2.7.3 [closed]
It looks like the only 64 bit windows installer for Numpy is for Numpy version 1.3.0 which only works with Python 2.6
6 Ans...
Fill between two vertical lines in matplotlib
I went through the examples in the matplotlib documentation, but it wasn't clear to me how I can make a plot that fills the area between two specific vertical lines.
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MySQL复制的概述、安装、故障、技巧、工具 - 数据库(内核) - 清泛网 - 专注...
...MyISAM表类型的话，可按如下方式操作：
shell> mysqldump --all-databases --master-data=1 > data.sql
注：master-data选项缺省会打开lock-all-tables，并写入CHANGE MASTER TO语句。
如果数据库使用的是InnoDB表类型的话，则应该使用single-transcation：
s...
Fastest way to remove first char in a String
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Angular.js ng-repeat across multiple tr's
I am using Angular.js for an application that uses hidden trs to simulate a sliding out effect by showing the tr and sliding down the div in the td below. This process worked fantastically using knockout.js when iterating over an array of these rows, because I could use <!-- ko:foreach --> a...
Force update of an Android app when a new version is available
...n forceUpgrade
boolean recommendUpgrade
When your app starts, you could call this API that pass in the current app version, and check the response of the versioning API call.
If forceUpgrade is true, show a popup dialog with options to either let user quit the app, or go to Google Play Store to ...
Hour from DateTime? in 24 hours format
...in 24 hours format.
For example:
If the hour is 2:20:23 p.m. i want to convert it to 14:20 and that's it.
5 Answers
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