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Schönemann, Rene

2009-Jun-18 12:37 UTC

[R] filtering number of values in a data frame

Dear list,

given is the following data frame df():

        Number           Place               Start                 End
1 218024740787 HHO     5   263 2008-01-02 00:21:14 2008-01-03 15:25:16
2 218024740787 HHO     5   263 2008-01-02 00:21:14 2008-01-02 00:21:14
3 318039091794 HHO     5   263 2008-01-02 00:21:14 2008-01-02 13:22:54
4 318039091794 HHO     5   263 2008-01-02 00:21:14 2008-01-02 00:21:14
5 318039379900 HHO     1   104 2008-01-02 06:45:01 2008-01-02 09:15:23

Now, I want to count the number of equal values of column "Start" but
I also want the other columns to be preserved.

Using:

	rle(as.character(df$Start)) -> m
	n <- data.frame(m$values, m$lengths)

produces a list of items according to their frequency of the Start point:

	             m.values m.lengths
	1 2008-01-02 00:21:14         4
	2 2008-01-02 06:45:01         1


I want now also other columns to be in this new data frame. It should look like
that:

	         Number           Place           m.values  m.lengths
	1 218024740787 HHO     5   263 2008-01-02 00:21:14         4
	2 318039379900 HHO     1   104 2008-01-02 06:45:01         1


Does anybody can help me with this?

Thanking you in advance!

Ren? Sch?nemann

-- 
______________________________________________________

Technische Universit?t Berlin
Institut f?r Land- und Seeverkehr
Fachgebiet Schienenfahrwege und Bahnbetrieb 
Prof. Dr.-Ing. habil. J?rgen Siegmann

Post        Sekretariat SG 18
            Salzufer 17-19
            D-10587 Berlin

Telefon     +49 (0)30 314 - 23 314 

Internet    http://www.railways.tu-berlin.de
______________________________________________________

Dipl.-Verk.wirtsch. Ren? Sch?nemann
- Wissenschaftlicher Mitarbeiter -

Telefon     +49 (0)30 314 - 22 710
Telefax     +49 (0)30 314 - 25 530

E-Mail      RSchoenemann at railways.tu-berlin.de
______________________________________________________

Technische Universit?t Berlin
K?rperschaft ?ffentlichen Rechts

Pr?sident   Prof. Dr. Kurt Kutzler

René Schönemann

2009-Jun-18 12:45 UTC

head link

[R] filtering number of values in a data frame

Dear list,

given is the following data frame df():

        Number           Place               Start                 End
1 218024740787 HHO     5   263 2008-01-02 00:21:14 2008-01-03 15:25:16
2 218024740787 HHO     5   263 2008-01-02 00:21:14 2008-01-02 00:21:14
3 318039091794 HHO     5   263 2008-01-02 00:21:14 2008-01-02 13:22:54
4 318039091794 HHO     5   263 2008-01-02 00:21:14 2008-01-02 00:21:14
5 318039379900 HHO     1   104 2008-01-02 06:45:01 2008-01-02 09:15:23

Now, I want to count the number of equal values of column "Start" but
I also
want the other columns to be preserved.

Using:

	rle(as.character(df$Start)) -> m
	n <- data.frame(m$values, m$lengths)

produces a list of items according to their frequency of the Start point:

	             m.values m.lengths
	1 2008-01-02 00:21:14         4
	2 2008-01-02 06:45:01         1


I want now also other columns to be in this new data frame. It should look
like that:

	         Number           Place           m.values  m.lengths
	1 218024740787 HHO     5   263 2008-01-02 00:21:14         4
	2 318039379900 HHO     1   104 2008-01-02 06:45:01         1


Does anybody can help me with this?

Thanking you in advance!

Ren? Sch?nemann

-- 
______________________________________________________

Technische Universit?t Berlin
Institut f?r Land- und Seeverkehr
Fachgebiet Schienenfahrwege und Bahnbetrieb 
Prof. Dr.-Ing. habil. J?rgen Siegmann

Post        Sekretariat SG 18
            Salzufer 17-19
            D-10587 Berlin

Telefon     +49 (0)30 314 - 23 314 

Internet    http://www.railways.tu-berlin.de
______________________________________________________

Dipl.-Verk.wirtsch. Ren? Sch?nemann
- Wissenschaftlicher Mitarbeiter -

Telefon     +49 (0)30 314 - 22 710
Telefax     +49 (0)30 314 - 25 530

E-Mail      RSchoenemann at railways.tu-berlin.de
______________________________________________________

Technische Universit?t Berlin
K?rperschaft ?ffentlichen Rechts

Pr?sident   Prof. Dr. Kurt Kutzler

Simon Pickett

2009-Jun-18 14:28 UTC

head link

[R] filtering number of values in a data frame

I think you can then use merge() to merge them back together

n<- merge(n, df, by.x = c("m.values"), by.y = c("Start"),
all.x = F, all.y =
F)

also see ?aggregate for a more efficient solution.

HTH, Si.

----- Original Message ----- 
From: "Sch?nemann, Rene" <RSchoenemann at Railways.TU-Berlin.de>
To: <R-help at r-project.org>
Sent: Thursday, June 18, 2009 1:37 PM
Subject: [R] filtering number of values in a data frame

> Dear list,
>
> given is the following data frame df():
>
>        Number           Place               Start                 End
> 1 218024740787 HHO     5   263 2008-01-02 00:21:14 2008-01-03 15:25:16
> 2 218024740787 HHO     5   263 2008-01-02 00:21:14 2008-01-02 00:21:14
> 3 318039091794 HHO     5   263 2008-01-02 00:21:14 2008-01-02 13:22:54
> 4 318039091794 HHO     5   263 2008-01-02 00:21:14 2008-01-02 00:21:14
> 5 318039379900 HHO     1   104 2008-01-02 06:45:01 2008-01-02 09:15:23
>
> Now, I want to count the number of equal values of column "Start"
but I
> also want the other columns to be preserved.
>
> Using:
>
> rle(as.character(df$Start)) -> m
> n <- data.frame(m$values, m$lengths)
>
> produces a list of items according to their frequency of the Start point:
>
>              m.values m.lengths
> 1 2008-01-02 00:21:14         4
> 2 2008-01-02 06:45:01         1
>
>
> I want now also other columns to be in this new data frame. It should look 
> like that:
>
>          Number           Place           m.values  m.lengths
> 1 218024740787 HHO     5   263 2008-01-02 00:21:14         4
> 2 318039379900 HHO     1   104 2008-01-02 06:45:01         1
>
>
> Does anybody can help me with this?
>
> Thanking you in advance!
>
> Ren? Sch?nemann
>
> -- 
> ______________________________________________________
>
> Technische Universit?t Berlin
> Institut f?r Land- und Seeverkehr
> Fachgebiet Schienenfahrwege und Bahnbetrieb
> Prof. Dr.-Ing. habil. J?rgen Siegmann
>
> Post        Sekretariat SG 18
>            Salzufer 17-19
>            D-10587 Berlin
>
> Telefon     +49 (0)30 314 - 23 314
>
> Internet    http://www.railways.tu-berlin.de
> ______________________________________________________
>
> Dipl.-Verk.wirtsch. Ren? Sch?nemann
> - Wissenschaftlicher Mitarbeiter -
>
> Telefon     +49 (0)30 314 - 22 710
> Telefax     +49 (0)30 314 - 25 530
>
> E-Mail      RSchoenemann at railways.tu-berlin.de
> ______________________________________________________
>
> Technische Universit?t Berlin
> K?rperschaft ?ffentlichen Rechts
>
> Pr?sident   Prof. Dr. Kurt Kutzler
>
> ______________________________________________
> R-help at r-project.org mailing list
> 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.
>
>

René Schönemann

2009-Jun-22 09:19 UTC

head link

[R] filtering number of values in a data frame

This does exactly what is needed.

Thanks guys!

 

-----Original Message-----
From: markleeds@verizon.net [mailto:markleeds@verizon.net] 
Sent: Thursday, June 18, 2009 5:30 PM
To: rene.schoenemann@tu-berlin.de
Subject: Re: [R] filtering number of values in a data frame

 


do.call(rbind,lapply(unname(split(DF,list(DF$X1,DF$START),drop=TRUE)),
function(.df) {
    data.frame(.df[1,1:4],count=nrow(.df))
}))





On Jun 18, 2009, René Schönemann <rene.schoenemann@tu-berlin.de> wrote: 

Dear list,

given is the following data frame df():

Number Place Start End
1 218024740787 HHO 5 263 2008-01-02 00:21:14 2008-01-03 15:25:16
2 218024740787 HHO 5 263 2008-01-02 00:21:14 2008-01-02 00:21:14
3 318039091794 HHO 5 263 2008-01-02 00:21:14 2008-01-02 13:22:54
4 318039091794 HHO 5 263 2008-01-02 00:21:14 2008-01-02 00:21:14
5 318039379900 HHO 1 104 2008-01-02 06:45:01 2008-01-02 09:15:23

Now, I want to count the number of equal values of column "Start" but
I also
want the other columns to be preserved.

Using:

rle(as.character(df$Start)) -> m
n <- data.frame(m$values, m$lengths)

produces a list of items according to their frequency of the Start point:

m.values m.lengths
1 2008-01-02 00:21:14 4
2 2008-01-02 06:45:01 1


I want now also other columns to be in this new data frame. It should look
like that:

Number Place m.values m.lengths
1 218024740787 HHO 5 263 2008-01-02 00:21:14 4
2 318039379900 HHO 1 104 2008-01-02 06:45:01 1


Does anybody can help me with this?

Thanking you in advance!

René Schönemann

-- 
______________________________________________________

Technische Universität Berlin
Institut für Land- und Seeverkehr
Fachgebiet Schienenfahrwege und Bahnbetrieb 
Prof. Dr.-Ing. habil. Jürgen Siegmann

Post Sekretariat SG 18
Salzufer 17-19
D-10587 Berlin

Telefon +49 (0)30 314 - 23 314 

Internet http://www.railways.tu-berlin.de
______________________________________________________

Dipl.-Verk.wirtsch. René Schönemann
- Wissenschaftlicher Mitarbeiter -

Telefon +49 (0)30 314 - 22 710
Telefax +49 (0)30 314 - 25 530

E-Mail RSchoenemann@railways.tu-berlin.de
______________________________________________________

Technische Universität Berlin
Körperschaft öffentlichen Rechts

Präsident Prof. Dr. Kurt Kutzler 

______________________________________________
R-help@r-project.org mailing list
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.


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