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How do you get the magnitude of a vector in Numpy?

In keeping with the "There's only one obvious way to do it", how do you get the magnitude of a vector (1D array) in Numpy? ...
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Why git keeps showing my changes when I switch branches (modified,added, deleted files) no matter if

I'm really new to git and I've been trying to understand why git keeps showing whatever I changed in one branch in another branch when I run git checkout to switch between branches First I tried not using git add and didn't work. However, I tried then using git add, but didn't fix the problem. I'm n...
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What is the difference between the hidden attribute (HTML5) and the display:none rule (CSS)?

HTML5 has a new global attribute, hidden , which can be used to hide content. 1 Answer ...
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How do I programmatically “restart” an Android app?

Firstly, I know that one should not really kill/restart an application on Android. In my use case I want to factory-reset my application in a specific case where a server sends a specific information to the client. ...
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How to get the URL without any parameters in JavaScript?

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Memcache(d) vs. Varnish for speeding up 3 tier web architecture

I'm trying to speed up my benchmark (3 tier web architecture), and I have some general questions related to Memcache(d) and Varnish. ...
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Django removing object from ManyToMany relationship

How would I delete an object from a Many-to-Many relationship without removing the actual object? 3 Answers ...
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Xcode can only refactor C and Objective-C code. How to rename swift class name in Xcode 6?

I have created a new Single View Application Project in Xcode 6 beta version. I want to rename swift class from ViewController.swift to some other name. But when I select Refactor -> Rename, it gives error Xcode can only refactor C and Objective-C code . ...
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Difference between CPPFLAGS and CXXFLAGS in GNU Make

What's the difference between CPPFLAGS and CXXFLAGS in GNU Make? 4 Answers 4 ...
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difference and when to use getApplication(), getApplicationContext(), getBaseContext() and someClass

I'm new to android and I'm trying to understand the difference between getApplication() , getApplicationContext( ), getBaseContext() , getContext() and someClass.this and especially when to use the these methods in the following code lines: ...