[R] Control the variable order after multiple declarations using within

[Eric Berger]

Nice suggestion, Richard.

On Wed, Jul 3, 2019 at 4:28 PM Richard O'Keefe <raoknz using gmail.com> wrote:

> Why not set all the new columns to dummy values to get the order you
> want and then set them to their final values in the order that works
> for that?
>
>
> On Thu, 4 Jul 2019 at 00:12, Kevin Thorpe <kevin.thorpe using utoronto.ca>
> wrote:
>
> >
> > > On Jul 3, 2019, at 3:15 AM, Sebastien Bihorel <
> > sebastien.bihorel using cognigencorp.com> wrote:
> > >
> > > Hi,
> > >
> > > The within function can be used to modify data.frames (among other
> > objects). One can even provide multiple expressions to modify the
> > data.frame by more than one expression. However, when new variables are
> > created, they seem to be inserted in the data.frame in the opposite order
> > they were declared:
> > >
> > >> df <- data.frame(a=1)
> > >> within(df, {b<-a*2; c<-b*3})
> > >  a c b
> > > 1 1 6 2
> > >
> > > Is there a way to insert the variables in an order consistent with the
> > order of declaration (ie, a, b, c)?
> > >
> >
> > One way is to use mutate() from the dplyr package.
> >
> >
> > > Thanks
> > >
> > > Sebastien
> > >
> > > ______________________________________________
> > > R-help using 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.
> >
> >
> > --
> > Kevin E. Thorpe
> > Head of Biostatistics,  Applied Health Research Centre (AHRC)
> > Li Ka Shing Knowledge Institute of St. Michael's
> > Assistant Professor, Dalla Lana School of Public Health
> > University of Toronto
> > email: kevin.thorpe using utoronto.ca  Tel: 416.864.5776  Fax: 416.864.3016
> >
> > ______________________________________________
> > R-help using 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.
> >
>
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>
> ______________________________________________
> R-help using 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.
>

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