[datatable-help] Access to local variables in "j" expressions

[Short, Tom]

I checked in a fix for this bug on R-forge. It should be available for installation tomorrow as follows (R-forge has been a little flakey lately):

install.packages("data.table",repos="http://r-forge.r-project.org")

If you're able to try it, let me know if it works or causes other problems.

- Tom

 

> -----Original Message-----
> From: datatable-help-bounces at lists.r-forge.r-project.org 
> [mailto:datatable-help-bounces at lists.r-forge.r-project.org] 
> On Behalf Of Short, Tom
> Sent: Saturday, May 08, 2010 10:58 AM
> To: Johann Hibschman; datatable-help at lists.r-forge.r-project.org
> Subject: Re: [datatable-help] Access to local variables in 
> "j" expressions
> 
> I've got a fix for this. It'll probably be a couple of days 
> before I can get it up to R-forge.
> 
> - Tom
> 
> > -----Original Message-----
> > From: datatable-help-bounces at lists.r-forge.r-project.org
> > [mailto:datatable-help-bounces at lists.r-forge.r-project.org]
> > On Behalf Of Short, Tom
> > Sent: Saturday, May 08, 2010 7:35 AM
> > To: Johann Hibschman; datatable-help at lists.r-forge.r-project.org
> > Subject: Re: [datatable-help] Access to local variables in "j" 
> > expressions
> > 
> > I think it's a bug, Johann. I'll dig deeper. Thanks for 
> reporting it.
> > 
> > - Tom
> >  
> > 
> > > -----Original Message-----
> > > From: datatable-help-bounces at lists.r-forge.r-project.org
> > > [mailto:datatable-help-bounces at lists.r-forge.r-project.org]
> > > On Behalf Of Johann Hibschman
> > > Sent: Friday, May 07, 2010 4:53 PM
> > > To: datatable-help at lists.r-forge.r-project.org
> > > Subject: [datatable-help] Access to local variables in "j" 
> > expressions
> > > 
> > > I'm just taking a look at data.table again, now that 
> 1.4.1 has been 
> > > released. I tried the following:
> > > 
> > >   dt.test <- data.table(n=c("a","a","b"), x=1:3, key="n")
> > > 
> > >   global.sum7 <- function (y) {
> > >    sum(y) + 7
> > >   }
> > > 
> > >   test.1 <- function (dt) {
> > >    local.sum7 <- global.sum7
> > >    dt[, list(out=local.sum7(x)), by=n]
> > >   }
> > > 
> > >   test.1(dt.test)
> > > 
> > >  This failed, with 'Error in eval(expr, envir, enclos) : 
> > > could not find function "local.sum7"'. Looking at the
> > documentation, I
> > > see:
> > > 
> > >      The j expression 'sees' variables in the calling frame
> > and above
> > >      including .GlobalEnv, see the examples. This is base R
> > >      functionality from eval() and with().
> > > 
> > > That led me to think that the above would work. Is this a
> > bug, or am I
> > > not understanding something?
> > > 
> > > Thanks,
> > > Johann
> > > _______________________________________________
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> > > datatable-help at lists.r-forge.r-project.org
> > > https://lists.r-forge.r-project.org/cgi-bin/mailman/listinfo/d
> > atatable-help
> > > 
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