From kevinushey at gmail.com  Wed Jul 15 21:43:49 2015
From: kevinushey at gmail.com (Kevin Ushey)
Date: Wed, 15 Jul 2015 12:43:49 -0700
Subject: [Rd] bquote/evalq behavior changed in R-3.2.1
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My best guess is that it could be related to this commit:
https://github.com/wch/r-source/commit/14f904c32a44010d4dfb8a829805648a88c22f53,
since that's the only change that's touched `rapply` lately.

On Wed, Jul 15, 2015 at 12:35 PM, Dayne Filer <dayne.filer at gmail.com> wrote:
> In 3.1.2 eval does not store the result of the bquote-generated call in the
> given environment. Interestingly, in 3.2.1 eval does store the result of
> the bquote-generated call in the given environment.
>
> In other words if I run the given example with eval rather than evalq, on
> 3.1.2 "x" is never stored in "fenv," but it is when I run the same code on
> 3.2.1. However, the given example stores "x" in "fenv" on 3.1.2, but throws
> the error I gave when run on 3.2.1.
>
> To give credit, I received the idea for using evalq from SO:
> http://stackoverflow.com/a/22559385
>
> Dayne
>
>
> On Wed, Jul 15, 2015 at 3:29 PM, William Dunlap <wdunlap at tibco.com> wrote:
>
>> I am curious why you used evalq instead of eval in this code.
>>
>> Bill Dunlap
>> TIBCO Software
>> wdunlap tibco.com
>>
>> On Wed, Jul 15, 2015 at 11:49 AM, Dayne Filer <dayne.filer at gmail.com>
>> wrote:
>>
>>> Hello,
>>>
>>> I upgraded from 3.1.2 to 3.2.1 and am receiving errors on code that worked
>>> as I intended previously. Briefly, I am using bquote to generate
>>> expressions to modify data.table objects within a  function, so I need the
>>> changes to actually be stored in the given environment. Previously, I used
>>> code like the following:
>>>
>>> test <- list(bquote(x <- 10))
>>> fenv <- environment()
>>> rapply(test, evalq, envir = fenv)
>>>
>>> Although the code in the example above is much simpler, it shows the
>>> problem. On 3.1.2 the expression is evaluated and x is stored as 10 in the
>>> given environment, fenv. In 3.2.1 the code throws an error:
>>>
>>> Error in eval(substitute(expr), envir, enclos) : object 'X' not found
>>>
>>> I could not find anything in the release notes that would explain this
>>> change. Changing evalq to eval works in 3.2.1, but eval does not store x
>>> in
>>> the given environment in 3.1.2.
>>>
>>> Thanks,
>>>
>>> Dayne
>>>
>>>         [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> R-devel at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-devel
>>>
>>
>>
>
>         [[alternative HTML version deleted]]
>
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[Rd] bquote/evalq behavior changed in R-3.2.1
Kevin Ushey