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Detecting that the browser has no mouse and is touch-only
...ifferent interface for touch (your finger hides the screen when you click) and mouse (relies heavily on hover preview).
How can I detect that my user has no mouse to present him the right interface? I plan to leave a switch for people with both mouse and touch (like some notebooks).
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How to copy an object in Objective-C
...copy a custom object that has objects of its own. I've been reading around and am a bit confused as to how to inherit NSCopying and how to use NSCopyObject.
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R command for setting working directory to source file location in Rstudio
... in R. Each R code is contained in a specific folder. There are data files and other files in there. I want to open the .r file and source it such that I do not have to change the working directory in Rstudio as shown below:
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JavaScript % (modulo) gives a negative result for negative numbers
...ug". The modulo operation is not very well defined over negative numbers, and different computing environments handle it differently. Wikipedia's article on the modulo operation covers it pretty well.
– Daniel Pryden
Dec 17 '10 at 4:08
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LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
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LEGO Mindstorms EV3 编程主机/套件 x 1
具有蓝牙功能的 Android 手机
已配对并开机的 EV3 机器人
传感器连接
请按照下图连接传感器：
颜色传感器：连接到 EV3 的端口 3
超声波传感器：连接到 EV3 的端口...
How can I extract audio from video with ffmpeg?
I tried the following command to extract audio from video:
12 Answers
12
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How do I create a variable number of variables?
...u can use dictionaries to accomplish this. Dictionaries are stores of keys and values.
>>> dct = {'x': 1, 'y': 2, 'z': 3}
>>> dct
{'y': 2, 'x': 1, 'z': 3}
>>> dct["y"]
2
You can use variable key names to achieve the effect of variable variables without the security ris...
Manual deployment vs. Amazon Elastic Beanstalk
...tages we get by using Elastic Beanstalk over maually creating EC2 instance and setting up tomcat server and deploy etc for a typical java web applicaion. Are load balancing, Monitoring and autoscaling the only advantages?
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Is there a way to list task dependencies in Gradle?
...n use the --all flag to get a more detailed listing of the available tasks and the task dependencies
gradle tasks --all
EDIT: as noted by Radim in the comments, this command does not report dependencies, for gradle 3.3 and newer (see https://docs.gradle.org/3.3/release-notes.html#improved-perform...
How to position a table at the center of div horizontally & vertically
...r, some tricks exist:
To center your table horizontally, you can set left and right margin to auto:
<style>
#test {
width:100%;
height:100%;
}
table {
margin: 0 auto; /* or margin: 0 auto 0 auto */
}
</style>
To center it vertically, the only way is to use javascr...