Thanks Simon. I missed that. It is a sensible change.
I had trouble because I had just changed computing environments this weekend (a
forced
change due to an institutional directive), and this caught me right after that
so I spent
some time chasing my tail. Murphy's law...
Terry T.
On 3/15/21 4:45 PM, Simon Urbanek wrote:
> Terry,
>
> NEWS: CHANGES IN R 4.0.0 NEW FEATURES
>
> \item S3 method lookup now by default skips the elements of the
> search path between the global and base environments.
>
> If you use attach(), S3 methods are hence no longer dispatched to (because it
> is between global and base) unless you register them using .S3method().
> Without registration you have to load them into the global env for them to
> work since this is now the only environment that doesn't require registration.
>
> Cheers,
> Simon
>
>
>
>> On Mar 16, 2021, at 7:19 AM, Therneau, Terry M., Ph.D. via R-devel
>> <r-devel@r-project.org> wrote:
>>
>> This change in R-devel just bit me. Under the newest release, if I
>> attach() another
>> .RData directory, the methods are not detected.
>> Was it intentional? Running in Linux. Here is a script of an example
>> that works fine
>> under 3.6.2. but fails in R-devel.
>>
>> tmt% mkdir temp1
>> tmt% cd temp1
>> tmt% R
>> # define a silly method, just for testing
>>
>> charlie <- function(x, ...)
>> UseMethod("charlie")
>>
>>
>> charlie.default <- function(x, ...) {
>> cat("default method ", x, "\n")
>> x +2
>> }
>>
>> charlie.character <- function(x, ...) {
>> cat("character method ", x, "\n")
>> as.character(as.numeric(x) + 2)
>> }
>>
>>> quit("yes")
>> tmt% cd ..
>> tmt% R
>>> attach("temp1/.RData")
>>> charlie( 4)
>> Error in UseMethod("charlie") :
>> no applicable method for 'charlie' applied to an object of class
>> "c('double', 'numeric')"
>>
>> ----------------------------------------
>>
>> The use case was my local test environment for the survival package. I can
>> work around it.
>>
>> --
>> Terry M Therneau, PhD
>> Department of Health Science Research
>> Mayo Clinic
>> thern...@mayo.edu
>>
>> "TERR-ree THUR-noh"
>>
>>
>> [[alternative HTML version deleted]]
>>
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>> R-devel@r-project.org mailing list
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>>
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