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]]
>
> ______________________________________________
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