Thank you for the exhausting answer.
Is it possible to add a note to the help page regarding the conclusion (or
even the edge cases)?
is it possible to add any validation for x in formula.character?
On 1 November 2016 at 21:48, William Dunlap <wdun...@tibco.com> wrote:
> Another example uses formula.character's other arguments:
> > as.formula("env")
> Error: object of type 'special' is not subsettable
> > as.formula("...")
> Error in eval(expr, envir, enclos) : '...' used in an incorrect context
>
>
> It may happen for the same reason that the following does not give an
> error:
> > y <- "response ~ pred1 + pred2"
> > as.formula("y")
> response ~ pred1 + pred2
>
> and that the followings give a somewhat surprising result
>
> > f <- function(x) { y <- "foo ~ bar" ; as.formula(x) }
> > f("y")
> response ~ pred1 + pred2
> <environment: 0x1e87978>
>
> The character method for formula works well if its 'x' argument looks like
> a formula, but it doesn't act consistently otherwise.
>
>
>
> Bill Dunlap
> TIBCO Software
> wdunlap tibco.com
>
> On Tue, Nov 1, 2016 at 12:54 PM, András Tajti <ata...@gmail.com> wrote:
>
>> Dear all,
>> I tried to run as.formula("x") and got an error message "Error: C stack
>> usage 7971120 is too close to the limit" whether x exists or not. This is
>> not the case in as.formula("y"), where "object 'y' not found" is the
>> error
>> message if y not exists, or "invalid formula" error or a formula depending
>> on y. Can anyone confirm this is not my special problem, or if it is, why
>> it can happen?
>>
>> Thank you:
>> András
>>
>> Below the output of sessionInfo():
>>
>> R version 3.3.1 (2016-06-21)
>> Platform: x86_64-pc-linux-gnu (64-bit)
>> Running under: Ubuntu 14.04.5 LTS
>>
>> locale:
>> [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
>> [3] LC_TIME=hu_HU.UTF-8 LC_COLLATE=en_US.UTF-8
>> [5] LC_MONETARY=hu_HU.UTF-8 LC_MESSAGES=en_US.UTF-8
>> [7] LC_PAPER=hu_HU.UTF-8 LC_NAME=C
>> [9] LC_ADDRESS=C LC_TELEPHONE=C
>> [11] LC_MEASUREMENT=hu_HU.UTF-8 LC_IDENTIFICATION=C
>>
>> attached base packages:
>> [1] stats graphics grDevices utils datasets methods base
>>
>> [[alternative HTML version deleted]]
>>
>> ______________________________________________
>> R-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-devel
>
>
>
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