R devel - Mar 2010 - switching to an previous R engine?

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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