[Rd] Eval and the enclos argument
Hi all, I'm trying to understand the default value of the enclos argument of eval: enclos = if(is.list(envir) || is.pairlist(envir)) parent.frame() else baseenv() Why isn't it just enclos = parent.frame() given that enclos is only meaningful (given my reading of the documentation) when envir is not an environment already. Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] Eval and the enclos argument
On 02/10/2010 7:57 AM, Hadley Wickham wrote: Hi all, I'm trying to understand the default value of the enclos argument of eval: enclos = if(is.list(envir) || is.pairlist(envir)) parent.frame() else baseenv() Why isn't it just enclos = parent.frame() given that enclos is only meaningful (given my reading of the documentation) when envir is not an environment already. Hadley I think that handles the case of envir=NULL. Duncan Murdoch __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] Eval and the enclos argument
On Sat, Oct 2, 2010 at 8:18 AM, Duncan Murdoch murdoch.dun...@gmail.com wrote: On 02/10/2010 7:57 AM, Hadley Wickham wrote: Hi all, I'm trying to understand the default value of the enclos argument of eval: enclos = if(is.list(envir) || is.pairlist(envir)) parent.frame() else baseenv() Why isn't it just enclos = parent.frame() given that enclos is only meaningful (given my reading of the documentation) when envir is not an environment already. Hadley I think that handles the case of envir=NULL. So that makes eval(expr, NULL) equivalent to eval(expr, baseenv()), right? Hadley -- Assistant Professor / Dobelman Family Junior Chair Department of Statistics / Rice University http://had.co.nz/ __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
Re: [Rd] Eval and the enclos argument
On 02/10/2010 10:40 AM, Hadley Wickham wrote: On Sat, Oct 2, 2010 at 8:18 AM, Duncan Murdoch murdoch.dun...@gmail.com wrote: On 02/10/2010 7:57 AM, Hadley Wickham wrote: Hi all, I'm trying to understand the default value of the enclos argument of eval: enclos = if(is.list(envir) || is.pairlist(envir)) parent.frame() else baseenv() Why isn't it just enclos = parent.frame() given that enclos is only meaningful (given my reading of the documentation) when envir is not an environment already. Hadley I think that handles the case of envir=NULL. So that makes eval(expr, NULL) equivalent to eval(expr, baseenv()), right? I think so. Duncan __ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
