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Equivalent of “throw” in R

How does one "throw" an error in R? I have a function that takes a data frame and some column names and does stuff with them. If the columns don't exist, I want the function to stop and to stop all functions depending on it. ...
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How slow are .NET exceptions?

... | edited Mar 6 '17 at 18:07 answered Oct 2 '08 at 12:15 ...
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Kill some processes by .exe file name

... | edited Nov 12 '18 at 20:02 Valamas 21.7k2323 gold badges9393 silver badges169169 bronze badges ...
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What Automatic Resource Management alternatives exist for Scala?

... 18 Here's James Iry solution using continuations: // standard using block definition def using[X ...
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Understanding reference counting with Cocoa and Objective-C

... answered Aug 11 '08 at 18:42 Andrew GrantAndrew Grant 55.8k2222 gold badges126126 silver badges139139 bronze badges ...
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Creating a singleton in Python

... Cat Plus PlusCat Plus Plus 108k2424 gold badges181181 silver badges212212 bronze badges 18 ...
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Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”

...404 error ? – SallyRothroat Mar 14 '18 at 13:54 1 That can happen if you include servlet 2.5 or o...
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Get current date in milliseconds

... | edited Mar 18 '18 at 9:18 answered May 27 '11 at 9:46 ...
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Why is UICollectionViewCell's outlet nil?

... 18 Thank you! Spent more than an hour on this as was using a custom cell. – DogCoffee Aug 18 '14 at 13:...
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Getting RAW Soap Data from a Web Reference Client running in ASP.net

... envelope request? – Ali Karaca May 18 '18 at 14:20  |  show 5 more comments ...