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@ variables in Ruby on Rails

What's the difference between @title and title ? Since both of them can be variable names. Also, how do I decide which kind of variable I should use? With @ or not? ...
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Change the maximum upload file size

...e a website hosted on a PC I have no access to. I have an upload form allowing people to upload mp3 files up to 30MB big. My server side script is done in PHP. ...
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Can dplyr package be used for conditional mutating?

Can the mutate be used when the mutation is conditional (depending on the values of certain column values)? 5 Answers ...
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When should I use the Visitor Design Pattern? [closed]

I keep seeing references to the visitor pattern in blogs but I've got to admit, I just don't get it. I read the wikipedia article for the pattern and I understand its mechanics but I'm still confused as to when I'd use it. ...
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android.view.InflateException: Binary XML file: Error inflating class fragment

I have a very frustrating error that I cannot explain. I created an Android application that uses Android AppCompat to make it compatible with older versions. Here is my main activity layout file: ...
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Is System.nanoTime() completely useless?

As documented in the blog post Beware of System.nanoTime() in Java , on x86 systems, Java's System.nanoTime() returns the time value using a CPU specific counter. Now consider the following case I use to measure time of a call: ...
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Visual Studio: How to show Overloads in IntelliSense?

... to view the overloads for a method is to actually edit the method by deleting the Parenthesis () and reopening them. 10 ...
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How do you install an APK file in the Android emulator?

I finally managed to obfuscate my Android application, now I want to test it by installing the APK file and running it on the emulator. ...
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How to printf uint64_t? Fails with: “spurious trailing ‘%’ in format”

I wrote a very simple test code of printf uint64_t: 3 Answers 3 ...
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How to enable mod_rewrite for Apache 2.2

I've got fresh install of Apache 2.2 on my Vista machine, everything works fine, except mod rewrite. 15 Answers ...