[R] Changes between R 3.1 vs 3.0.3

Duncan Murdoch murdoch.duncan at gmail.com
Mon Apr 7 20:28:30 CEST 2014

On 07/04/2014 1:22 PM, Marc Girondot wrote:
> If there a list of changes between 3.1 and 3.0.3 ?

If you have 3.1.0rc installed, look in the HTML help system for the NEWS 
item.  If you don't have it installed, a copy of the nightly news is on 
CRAN under "new features in this version" on 
<http://cran.r-project.org/bin/windows/base/rtest.html>.  (The actual 
URL changes sometimes; currently it is 

The RSS feed that Ista pointed you to will tell you about changes to 
that file (i.e. sort of second differences to R).

Duncan Murdoch

> For example, when using levels(xxxx), if xxxx was not a factor, in 3.0.3
> it was changed as a factor but in 3.1 RC it returns NULL.
> Same for automatic conversion in numeric for characters used in algebric
> operations.
> New way is more strict and is better in my point of view. It will
> prevent unwanted side effect in code.
> Thanks a lot
> Marc Girondot
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