[R] add an idx column to the matrix
PIKAL Petr
petr.pikal at precheza.cz
Tue Aug 11 08:40:06 CEST 2015
Hi
here is another approach.
> cbind(mydata, idx=(rowSums(mydata==2, na.rm=T)>0)*1)
X125 X255 X558 X2366 X177 X255.1 idx
aa 0 1 0 NA 0 0 0
bb 1 1 0 NA 0 1 0
cs 2 1 2 1 0 0 1
de 0 1 0 NA 0 0 0
gh 2 0 0 0 0 0 1
It shall be faster if this is an issue.
Cheers
Petr
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Thierry
> Onkelinx
> Sent: Monday, August 10, 2015 10:29 PM
> To: Lida Zeighami
> Cc: r-help at r-project.org
> Subject: Re: [R] add an idx column to the matrix
>
> Dear Lida,
>
> Here is a solution. Please don't post in HTML. And provide an easy to
> use
> example of the data. E.g. the output of dput(mydata)
>
> set.seed(1234)
> mydata <- matrix(
> sample(
> c(0, 1, 2, NA),
> size = 30,
> replace = TRUE,
> prob = c(2, 1, 1, 1)
> ),
> ncol = 6
> )
>
> idx <- apply(mydata, 1, function(x){any(x == 2)})
> idx[is.na(idx)] <- FALSE
> cbind(mydata, idx)
>
>
>
> ir. Thierry Onkelinx
> Instituut voor natuur- en bosonderzoek / Research Institute for Nature
> and
> Forest
> team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
> Kliniekstraat 25
> 1070 Anderlecht
> Belgium
>
> To call in the statistician after the experiment is done may be no more
> than asking him to perform a post-mortem examination: he may be able to
> say
> what the experiment died of. ~ Sir Ronald Aylmer Fisher
> The plural of anecdote is not data. ~ Roger Brinner
> The combination of some data and an aching desire for an answer does
> not
> ensure that a reasonable answer can be extracted from a given body of
> data.
> ~ John Tukey
>
> 2015-08-10 22:11 GMT+02:00 Lida Zeighami <lid.zigh at gmail.com>:
>
> > Hi there,
> >
> > I have a matrix contain 0,1,2, NA elements.
> > I want to add a column to this matrix with name of "idx" . then for
> each
> > row, I should put 1 in this column (idx) if there is at least one 2
> in that
> > row otherwise I should put 0 in this column!
> >
> > for example mydata:
> >
> > 125 255 558 2366 177 255
> > aa 0 1 0 NA 0 0
> > bb 1 1 0 NA 0 1
> > cs 2 1 2 1 0 0
> > de 0 1 0 NA 0 0
> > gh 2 0 0 0 0 0
> >
> >
> > my output should be:
> >
> >
> > 125 255 558 2366 177 255 idx
> > aa 0 1 0 NA 0 0 0
> > bb 1 1 0 NA 0 1 0
> > cs 2 1 2 1 0 0 1
> > de 0 1 0 NA 0 0 0
> > gh 2 0 0 2 0 2 1
> >
> > Thank you for your help.
> >
> > [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at 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.
> >
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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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