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: "Schönemann, Rene" <rschoenem...@railways.tu-berlin.de>
To: <R-help@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!
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 rschoenem...@railways.tu-berlin.de
______________________________________________________
Technische Universität Berlin
Körperschaft öffentlichen Rechts
Präsident Prof. Dr. Kurt Kutzler
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and provide commented, minimal, self-contained, reproducible code.
