[R] tclArray() --- "active"?!

[Dalthorp, Daniel]

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 <pdalgd at 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 <ddalthorp at 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
> > ddalthorp at usgs.gov
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
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> > PLEASE do read the posting guide
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> > 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.mes at cbs.dk  Priv: PDalgd at gmail.com
>
>
>
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-- 
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
ddalthorp at usgs.gov

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