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

[Richard O'Keefe]

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
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> > 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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