[Rd] as-cran issue

[Ben Bolker]

  From R NEWS (changes in 3.6.0)

Experimentally, setting environment variable _R_CHECK_LENGTH_1_LOGIC2_
will lead to warnings (or errors if the variable is set to a ‘true’
value) when && or || encounter and use arguments of length more than one.

On 2020-01-13 11:46 a.m., Therneau, Terry M., Ph.D. via R-devel wrote:
> Thanks for the feedback Dirk.   I sent my follow-up before I saw it.
> 
> Looking at the source code, it appears that there is no options() call
> to turn this on. Nor does "R --help" reveal a command line option.
> How then does a user turn this on outside of the R CMD check
> envirionment, so as to chase things like this down?
> 
> The fact that 1. renaming my function makes the error go away, 2. my
> function is just a wrapper to inherits(), and 3. its a new error in code
> that hasn't changed, all point me towards some oddity with the check
> function.
> 
> Terry
> 
> 
> On 1/13/20 10:22 AM, Dirk Eddelbuettel wrote:
>>
>> On 13 January 2020 at 10:02, Therneau, Terry M., Ph.D. via R-devel wrote:
>> | Where can I find out (and replicate) what options as-cran turns on?
>>
>> See the file src/library/tools/R/check.R in the R sources, and grep for
>> as_cran which is the internal variable controlled by the --as-cran option
>>
>> [...]
>>
>> | The check log contains multiple instances of the lines below:
>> |
>> | < Warning message:
>> | < In if (ismat(kmat)) { :
>> | <   the condition has length > 1 and only the first element will be
>> used
>> |
>> | I don't see how the error could arise, but if I know what as-cran is
>> doing perhaps I can
>> | replicate it.
>>
>> This was widely discussed on this list and should also be in the NEWS
>> file.
>>
>> The change is about what the message says: the if () tests a scalar
>> logical,
>> it appears that ismat(kmat) returns more than a scalar.
>>
>> There has always been an opt-in for this to error -- cf many messages
>> by Henrik
>> over the years as he tried to convince us all to use it more.
>>
>>
>> Dirk
>>
> 
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