# [R] how to create a new column from two columns with conditions

Ana Marija @okov|c@@n@m@r|j@ @end|ng |rom gm@||@com
Thu Apr 30 00:20:16 CEST 2020

```Thank you so much, numbers add up now!

On Wed, Apr 29, 2020 at 5:09 PM <cpolwart using chemo.org.uk> wrote:
>
> While I've sent you a maths way to do it,
>
> I'd probably take this approach;
>
> # set b\$pheno to 1 as default
>
> b\$pheno <- 1
>
> # set the flaser
>
> b\$pheno[b\$flaser == 2] <- 2
>
> #set the plaser
>
> b\$pheno[b\$plaser == 2] <- 2
>
>
> On 29 Apr 2020 22:44, Ana Marija <sokovic.anamarija using gmail.com> wrote:
>
> Hi Rui,
>
> thanks for getting back to me
> so I tried your method and I got:
> > sum(b\$PHENO==2, na.rm=T)
> [1] 828
> > sum(b\$PHENO==1, na.rm=T)
> [1] 859
>
> Can you please tell me if
> b\$PHENO <- (b\$FLASER == 2 | b\$PLASER == 2) + 1L
>
> just assigns PHENO=2 if b\$FLASER == 2 | b\$PLASER == 2 and everything else is 1?
>
> Please see how my data looks like:
> > sum(b\$FLASER==2, na.rm=T)
> [1] 92
> > sum(b\$FLASER==1, na.rm=T)
> [1] 1533
> > sum(b\$PLASER==1, na.rm=T)
> [1] 850
> > sum(b\$PLASER==2, na.rm=T)
> [1] 806
> > dim(b)
> [1] 1698    5
> > unique(b\$FLASER)
> [1]  1  3  2 NA
> > unique(b\$PLASER)
> [1]  1  2  3 NA
>
> On Wed, Apr 29, 2020 at 4:10 PM Rui Barradas <ruipbarradas using sapo.pt> wrote:
> >
> > Hello,
> >
> > Here is another way. The condition returns FALSE/TRUE or 0/1. Add 1 to
> > get the expected result.
> > It has the advantage of being faster.
> >
> > b\$PHENO <- (b\$FLASER == 2 | b\$PLASER == 2) + 1L
> >
> >
> > Hope this helps,
> >
> >
> > Às 20:42 de 29/04/20, Ana Marija escreveu:
> > > Thanks, I did this:
> > > b\$PHENO<- ifelse(b\$FLASER ==2 | b\$PLASER ==2, 2, 1)
> > >
> > > On Wed, Apr 29, 2020 at 2:36 PM Ivan Krylov <krylov.r00t using gmail.com> wrote:
> > >>
> > >> On Wed, 29 Apr 2020 14:19:18 -0500
> > >> Ana Marija <sokovic.anamarija using gmail.com> wrote:
> > >>
> > >>> My conditions for creating a new column PHENO would be this:
> > >>>
> > >>> if FLASER or PLASER =2 then PHENO=2
> > >>> otherwise PHENO=1
> > >>
> > >> On Wed, 29 Apr 2020 15:30:45 -0400
> > >> "Patrick (Malone Quantitative)" <malone using malonequantitative.com> wrote:
> > >>
> > >>> If you don't mind using tidyverse, you can do this easily with
> > >>> if_else.
> > >>
> > >> ...and if you want to stay with base R, you can use the ifelse
> > >> function.
> > >>
> > >> --
> > >> Best regards,
> > >> Ivan
> > >
> > > ______________________________________________
> > > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > and provide commented, minimal, self-contained, reproducible code.
> > >
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> and provide commented, minimal, self-contained, reproducible code.
>
>

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