Re: [R] how to "singlify" entries

From: Petr Pikal <petr.pikal_at_precheza.cz>
Date: Mon 30 May 2005 - 23:27:53 EST

On 30 May 2005 at 21:56, Charles Plessy wrote:

> On Mon, May 30, 2005 at 09:15:32AM +0000, zhihua li wrote :
> > hi netters
> >
> > I have a rather simple question. I have a data frame with two
> > variables X and Y, both of which are factors. X has 100 levels while
> > Y has 10 levels only. The data frame has 100 rows in all, so for X
> > the values are unique, and Y has many replicate values. Now I wanna
> > reduce the data frame into 10 rows only, according to the 10 levels
> > of Y. I don't care which value of X is in the same row with Y in
> > the final data frame, as long as it is in agreement with the
> > original data frame.
>
> Dear list,
>
> I am a new subscriber, using R to analyse genomics data. I have a
> similar question, maybe even identical, but I am not sure...

Hallo

Me neither.

?reshape

> dat<-read.table("clipboard", header=T)
> dat

  F1 F2 V
1 A X 3
2 A Y 6
3 B X 5
4 C X 9
5 C Y 3
> reshape(dat, idvar="F1", timevar="F2",direction="wide")
  F1 V.X V.Y
1 A 3 6
3 B 5 NA
4 C 9 3

Homework: change NA to zero.

HTH
Petr

>
> >From a data frame with two factors and one value, I would like to
> >obtain a data
> frame with one factor and one value per level in the removed factor.
>
> For instance:
>
> F1 F2 V
> -----------------
> A X 3
> A Y 6
> B X 5
> C X 9
> C Y 3
>
> Would become:
>
> F1 VX VY
> ------------------
> A 3 6
> B 5 0
> C 9 3
>
> I am sure I have seen a tool to do this some time ago, but I do not
> remember its name.
>
> Can somebody help me ?
>
> Best regards,
>
> --
> Charles Plessy, Ph.D. - Genome Science Laboratory
> The Institute for Physical and Chemical Research (RIKEN)
> 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
> plessy@riken.jp -- Fax: 048-462-4686 -- Tel: 048-467-9515
>
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Petr Pikal
petr.pikal@precheza.cz



R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Mon May 30 23:33:59 2005

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