[R] add an idx column to the matrix

[Lida Zeighami]

Dear all,
Thank you so much for your helps.
They all works! But I think the Petr solution is the best!

Thanks again.
On Aug 11, 2015 1:40 AM, "PIKAL Petr" <petr.pikal at precheza.cz> wrote:

> 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]]
> > >
> > > ______________________________________________
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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.
> > >
> >
> >       [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > and provide commented, minimal, self-contained, reproducible code.
>
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