[Rd] as.formula("x") error on C stack limit

[András Tajti]

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 <wdunlap at 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 <atajti at 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
>>
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>>
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>
>
>

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