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Efficiently checking if arbitrary object is NaN in Python / numpy / pandas?

My numpy arrays use np.nan to designate missing values. As I iterate over the data set, I need to detect such missing values and handle them in special ways. ...
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What are “signed” cookies in connect/expressjs?

I am trying to figure out what "signed cookies" actually are. There isn't much on the net, and if I try this: 4 Answers ...
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Does making a struct volatile make all its members volatile?

If I have: 2 Answers 2 ...
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Do you need break in switch when return is used?

I was wondering if I need to use "break" in "switch" function when "return" is used. 7 Answers ...
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Call Go functions from C

I am trying to create a static object written in Go to interface with a C program (say, a kernel module or something). 4 An...
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How to extract the first two characters of a string in shell scripting?

For example, given: 14 Answers 14 ...
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How to securely store access token and secret in Android?

I am going to use oAuth to fetch mails and contacts from google. I don't want to ask the user each time to log in to obtain an access token and secret. From what I understood, I need to store them with my application either in a database or SharedPreferences . But I am a bit worried about security ...
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Java Synchronized Block for .class

What does this java code mean? Will it gain lock on all objects of MyClass ? 4 Answers ...
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How does @synchronized lock/unlock in Objective-C?

Does @synchronized not use "lock" and "unlock" to achieve mutual exclusion? How does it do lock/unlock then? 5 Answers ...
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How to add \newpage in Rmarkdown in a smart way?

I wonder if one could simply use LaTeX \newpage command in R markdown v2 in a different way than this: 3 Answers ...