[R] id & filter problems in data.frame

[Yves Brostaux]

Hello,

>Date: Tue, 28 May 2002 10:30:14 +0200
>From: Christian Schulz <c.schulz at metrinomics.de>
>Subject: [R] id  & filter problems in data.frame
>
>Hi,
>a questionaire data-set with more than one row for one Person make
>me problems.
>
>(1) i want create a function which count the used
>row for the relevant id !
>example:
>id  c.row
>1    1
>1    2
>1    3
>2    1
>2    2
>4    1
>4    2
>4    3
>4    4
>4    5

I think the following function should do the trick (obtaining c.row from id 
if I understood well the problem) :

count <- function(id) {
   temp <- tapply(id, id, function(x) {x <- rep(1, length(x)); cumsum(x)})
   temp <- unlist(temp)
   names(temp) <- NULL
   return(temp)
}

 > id <- rep(c(1, 2, 4), c(3, 2, 5))
 > id
  [1] 1 1 1 2 2 4 4 4 4 4
 > c.row <- count(id)
 > c.row
  [1] 1 2 3 1 2 1 2 3 4 5

>(2)  i have got a problem to filter & analyse , because the filter
>criteria is unlucky
>a row above or under the ratings which i would like to analyse !

I fear I don't understand what you want to do...


>Thanks for any suggestions/starting point
>Christian Schulz

I hope it helped a bit !

Y. Brostaux

>Metrinomics GmbH
>Fon: +49 (0)30  69 51 71 - 16
>Fax: +49 (0)30  69 51 71 - 33
>mailto:c.schulz at metrinomics.de
>http://www.metrinomics.de
>
>
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         YVES BROSTAUX - Ingénieur agronome Orientation Eaux & Forêts
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