[Rd] switching to an previous R engine?

From: Thorpe, Jason D <jthorpe_at_fhcrc.org>
Date: Thu, 11 Mar 2010 09:14:03 -0800


Hello,  

I have quite a few programs that I have written over the last 5 years that rely on the old R engine (2.6.2 and earlier) returning a null when an invalid index is used, as in:  

> df <- data.frame(x = 1)

> df[,'y']

NULL   Is there a way to tell R to return NULLs instead of raising errors within a function or package? I'm a fan of the raising errors instead of returning values that could be confused with a legitimate return value, but for now I'm stuck using 2.6.2 until I have time to check every line of code I've written in the last 5 years.  

Thanks!  

Jason Thorpe

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