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What is a “symbol” in Julia?

Specifically: I am trying to use Julia's DataFrames package, specifically the readtable() function with the names option, but that requires a vector of symbols. ...
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When does invoking a member function on a null instance result in undefined behavior?

Consider the following code: 2 Answers 2 ...
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Keystore type: which one to use?

By looking at the file java.security of my JRE , I see that the keystore type to use by default is set to JKS . Here , there is a list of the keystore types that can be used. ...
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How to prove that a problem is NP complete?

I have problem with scheduling. I need to prove that the problem is NP complete. What can be the methods to prove it NP complete? ...
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Can I unshelve to a different branch in tfs 2008?

Let's assume that some developer in my team shelved his changes that he did in branch A. And I am working on branch B. Can I unshelve his changes into branch B? (By GUI or command prompt) ...
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Python: How would you save a simple settings/config file?

I don't care if it's JSON , pickle , YAML , or whatever. 6 Answers 6 ...
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REST response code for invalid data

What response code should be passed to client in case of following scenarios? 4 Answers ...
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Casperjs/PhantomJs vs Selenium

We are using Selenium to automate our UI testing. Recently we have seen majority of our users using Chrome. So we wanted to know - pros and cons of using PhantomJS vs Selenium: ...
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Difference between a Postback and a Callback

I keep on hearing this words ' callback ' and ' postback ' tossed around. What is the difference between two ? 6 Answers...
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How to expire session due to inactivity in Django?

Our Django application has the following session management requirements. 6 Answers 6 ...