[R] add an idx column to the matrix

PIKAL Petr petr.pikal at precheza.cz
Thu Aug 13 08:07:44 CEST 2015


Hi

the error is not caused by missing 2

> set.seed(333)
> x<-sample(0:1, 12, rep=T)
> dim(x)<-c(3,4)
> x[2,2]<-NA
> cbind(x, idx=(rowSums(x==2, na.rm=TRUE)>0)*1)
              idx
[1,] 0  1 1 0   0
[2,] 0 NA 0 0   0
[3,] 1  1 0 0   0

As Sarah pointed out, you are the only one observing such error. Without more information – at least  structure of your data

see ?str

but preferably part of your data causing error and a code you hardly get any sensible advice.

Cheers
Petr
From: Lida Zeighami [mailto:lid.zigh at gmail.com]
Sent: Wednesday, August 12, 2015 6:23 PM
To: PIKAL Petr
Subject: Re: [R] add an idx column to the matrix

Dear Petr,

I use your code in a loop function, but in some matrix there isn't any 2 so I got the below error:

Error in rowSums(lofGT_met == 2, na.rm = T) :
  'x' must be an array of at least two dimensions

would you please let me know how to correct it?
Thanks,
Lida

On Tue, Aug 11, 2015 at 1:40 AM, PIKAL Petr <petr.pikal at precheza.cz<mailto: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<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<mailto: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<http://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<mailto: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<mailto: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<mailto: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.


________________________________
Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům.
Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému.
Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat.
Odesílatel e-mailu neodpovídá za eventuální škodu způsobenou modifikacemi či zpožděním přenosu e-mailu.

V případě, že je tento e-mail součástí obchodního jednání:
- vyhrazuje si odesílatel právo ukončit kdykoliv jednání o uzavření smlouvy, a to z jakéhokoliv důvodu i bez uvedení důvodu.
- a obsahuje-li nabídku, je adresát oprávněn nabídku bezodkladně přijmout; Odesílatel tohoto e-mailu (nabídky) vylučuje přijetí nabídky ze strany příjemce s dodatkem či odchylkou.
- trvá odesílatel na tom, že příslušná smlouva je uzavřena teprve výslovným dosažením shody na všech jejích náležitostech.
- odesílatel tohoto emailu informuje, že není oprávněn uzavírat za společnost žádné smlouvy s výjimkou případů, kdy k tomu byl písemně zmocněn nebo písemně pověřen a takové pověření nebo plná moc byly adresátovi tohoto emailu případně osobě, kterou adresát zastupuje, předloženy nebo jejich existence je adresátovi či osobě jím zastoupené známá.

This e-mail and any documents attached to it may be confidential and are intended only for its intended recipients.
If you received this e-mail by mistake, please immediately inform its sender. Delete the contents of this e-mail with all attachments and its copies from your system.
If you are not the intended recipient of this e-mail, you are not authorized to use, disseminate, copy or disclose this e-mail in any manner.
The sender of this e-mail shall not be liable for any possible damage caused by modifications of the e-mail or by delay with transfer of the email.

In case that this e-mail forms part of business dealings:
- the sender reserves the right to end negotiations about entering into a contract in any time, for any reason, and without stating any reasoning.
- if the e-mail contains an offer, the recipient is entitled to immediately accept such offer; The sender of this e-mail (offer) excludes any acceptance of the offer on the part of the recipient containing any amendment or variation.
- the sender insists on that the respective contract is concluded only upon an express mutual agreement on all its aspects.
- the sender of this e-mail informs that he/she is not authorized to enter into any contracts on behalf of the company except for cases in which he/she is expressly authorized to do so in writing, and such authorization or power of attorney is submitted to the recipient or the person represented by the recipient, or the existence of such authorization is known to the recipient of the person represented by the recipient.

	[[alternative HTML version deleted]]



More information about the R-help mailing list