Thanks, Peter. When it comes time to read the array back to R, I can explicitly delete the "active" cell first...
On Wed, Jul 6, 2016 at 8:35 AM, peter dalgaard <pda...@gmail.com> wrote: > I am not up to speed on Tcl/Tk these days, but I would suspect that the > issue lies in tkTable and not in tclArray. The table widget has the notion > of an active cell, which can be used in indexing operations. According to > the widget documentation > > -- > Command-Line Name:-variable > Database Name: variable > Database Class: Variable > > Global Tcl array variable to attach to the table's C array. It will be > created if it doesn't already exist or is a simple variable. Keys used by > the table in the array are of the form row,col for cells and the special > key active which contains the value of the active cell buffer. [...] > -- > > I think this suggests that you just need to assume that the "active" > element might be there when you deal with the tclArray and work around it > if it gets in the way. > > (A conjecture as to why it appears in your example could be that you > deleted the row with the active cell, and that the widget needs to record > the fact that there is now no active cell.) > > -pd > > > > On 06 Jul 2016, at 16:18 , Dalthorp, Daniel <ddalth...@usgs.gov> wrote: > > > > Sometimes when working with tclArray's, an empty element called "active" > is > > appended to the array. Does anyone know when (and why) this happens? And > > how to prevent it (or at least predict it so that it can be removed by > > hand)? > > > > E.g., > > library(tcltk); library(tcltk2) > > tt<-tktoplevel() > > dat<-tclArray() > > tab<-tk2table(tt, variable = dat) > > tkgrid(tab) > > dat[[0,0]]<-5 > > dat[[1,0]]<-4 > > dat[[2,0]]<-56 > > tkdelete(tab,"rows",2, 8) > > names(dat) > > > > Any help would be greatly appreciated! > > > > -Dan > > > > -- > > Dan Dalthorp, PhD > > USGS Forest and Rangeland Ecosystem Science Center > > Forest Sciences Lab, Rm 189 > > 3200 SW Jefferson Way > > Corvallis, OR 97331 > > ph: 541-750-0953 > > ddalth...@usgs.gov > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > > -- > Peter Dalgaard, Professor, > Center for Statistics, Copenhagen Business School > Solbjerg Plads 3, 2000 Frederiksberg, Denmark > Phone: (+45)38153501 > Office: A 4.23 > Email: pd....@cbs.dk Priv: pda...@gmail.com > > > > > > > > > > -- Dan Dalthorp, PhD USGS Forest and Rangeland Ecosystem Science Center Forest Sciences Lab, Rm 189 3200 SW Jefferson Way Corvallis, OR 97331 ph: 541-750-0953 ddalth...@usgs.gov [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
