[Rd] source and textConnection

Duncan Murdoch murdoch at stats.uwo.ca
Fri Oct 23 20:57:03 CEST 2009

On 10/23/2009 8:27 AM, Duncan Murdoch wrote:
> On 10/22/2009 7:21 AM, Erich Neuwirth wrote:
>> Using todays freshly downloaded compiled version of R-2.10.0 beta
>> let me pose this question once again:
>>>> myconn<-textConnection("print(11*11)")
>>>> source(myconn)
>> produces
>>> [1] 121
>>> Warning message:
>>> In source(myconn) : argument 'encoding = "native.enc"' will be ignored
>> So I get a warning about a default parameter value I did not use myself.
>> This is somewhat strange.
>> Up to 2.9.2 this warning did not show up,
>> and 2.9.2 also has the encoding parameter.
>> source(myconn,encoding="unknown")
>> does not produce a warning.
>> Will it remain like this?
>> I am asking because then I have to adapt a certain mechanism in RExcel.
> I spent a little time looking into this yesterday, and it appears to 
> have shown up quite a while ago (it was there in July builds, for 
> instance).  I will eventually track it down, but certainly not for 2.10.0.

Nothing is certain.  I found that this warning came from something I 
introduced in May; it appears to me to be in the class of trivial bugs 
that the development guidelines allow to be fixed now.  So I've 
committed the change to the 2.10.0 branch.

Duncan Murdoch

> Generally bugs are easier to find when they're fresh, which is why we 
> ask people to try out the R-devel builds.  In this case, it's obvious 
> how to fix the bug, but I'd rather not do that until I see what the 
> change that caused it was intended to do:  I don't want to undo that.
> Duncan Murdoch
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