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Problem while reading Data from a data frame

10 messages · ONKELINX, Thierry, Baro, PIKAL Petr +1 more

ONKELINX, Thierry
# 
You don't need a loop nor a growing object.

data(mtcars)
mtcars
mtcars[seq(1, nrow(mtcars), by = 2), ]

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
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be
www.inbo.be

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


-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] Namens Baro
Verzonden: dinsdag 5 november 2013 15:42
Aan: R help
Onderwerp: [R] Problem while reading Data from a data frame

Hi experts,

I want to read only the half of my data frame, which I read it from clip board, and save it in a list. I wrote this code but it doesnt work:

ck<-read.table("clipboard")
datalist<-list()
d<-dim(ck)[1]
i<-1

repeat
{
  datalist<-c(datalist,ck[i,])
  i<-i+2
  if(i>d)
  {break}
}
datalist


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PIKAL Petr
# 
Hi

You shall probably use C or similar program for such task.

As I understand you want only odd rows. If yes, this will do it for you

odd<-seq(1,d,2)
datalist<-cd[odd,]

If not please explain better your real intention.

Regards
Petr
PIKAL Petr
# 
Sorry

shall be
datalist<-ck[odd,]

Regards
Petr
Bert Gunter
# 
Please follow Petr's advice and read the Introduction to R or other R
online tutorial (there are many) before posting further basic
questions here. You need to make an effort to learn the basics of R
before pestering this list with questions such as these.

Cheers,
Bert
On Tue, Nov 5, 2013 at 7:35 AM, Baro <babakbsn at gmail.com> wrote: