R help - Aug 2003 - (no subject)

Hi everybody,

Hope your are not all on holyday because I've got a problem that is going to
drive me crazy...

I would like to remove some rows from a dataframe. The rows correspond to
some
specific indexes which I can get by looking at the name in the first column
of my dataset. But I manage to get only the opposite of what I really want
(function #1)

#Function#1:
remove.func<-function(data){
Name<-as.character(data[,1])
indexZZ<-grep("ZZ",Name,value=FALSE)
data<-data[indexZZ,] # give me what I don't want
print(slide)
}

#Function#2:
remove.func<-function(data,Name){
Name<-as.character(data[,1])
indexZZ<-grep("ZZ",Name,value=FALSE)
data<-data[!indexZZ,] #doesn't work, give an empty dataframe
print(slide)
}

Thanks :|

Nolwenn Le Meur

********************************************
Nolwenn Le Meur
INSERM U533
Facult? de m?decine
1, rue Gaston Veil
44035 Nantes Cedex 1
France

Tel: (+33)-2-40-41-29-86 (office)
     (+33)-2-40-41-28-44 (secretary)
Fax: (+33)-2-40-41-29-50
mail: nolwenn.lemeur at nantes.inserm.fr

data[-indexZZ,] as grep returns indices of the matching rows.

On Wed, 6 Aug 2003, Nolwenn Le Meur wrote:
> Hi everybody,
> 
> Hope your are not all on holyday because I've got a problem that is
going to
> drive me crazy...
Reading the documentation would avoid that!
> I would like to remove some rows from a dataframe. The rows correspond to
> some
> specific indexes which I can get by looking at the name in the first column
> of my dataset. But I manage to get only the opposite of what I really want
> (function #1)
> 
> #Function#1:
> remove.func<-function(data){
> Name<-as.character(data[,1])
> indexZZ<-grep("ZZ",Name,value=FALSE)
> data<-data[indexZZ,] # give me what I don't want
> print(slide)
> }
> 
> #Function#2:
> remove.func<-function(data,Name){
> Name<-as.character(data[,1])
> indexZZ<-grep("ZZ",Name,value=FALSE)
> data<-data[!indexZZ,] #doesn't work, give an empty dataframe
> print(slide)
> }
> 
> Thanks :|
> 
> Nolwenn Le Meur
> 
> ********************************************
> Nolwenn Le Meur
> INSERM U533
> Facult? de m?decine
> 1, rue Gaston Veil
> 44035 Nantes Cedex 1
> France
> 
> Tel: (+33)-2-40-41-29-86 (office)
>      (+33)-2-40-41-28-44 (secretary)
> Fax: (+33)-2-40-41-29-50
> mail: nolwenn.lemeur at nantes.inserm.fr
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> 
> 
-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

Nolwenn Le Meur wrote:
> Hi everybody,
> 
> Hope your are not all on holyday because I've got a problem that is
going to
> drive me crazy...
No comment on that sentence, but please use the subject line ....
> I would like to remove some rows from a dataframe. The rows correspond to
> some
> specific indexes which I can get by looking at the name in the first column
> of my dataset. But I manage to get only the opposite of what I really want
> (function #1)
> 
> #Function#1:
> remove.func<-function(data){
> Name<-as.character(data[,1])
> indexZZ<-grep("ZZ",Name,value=FALSE)
> data<-data[indexZZ,] # give me what I don't want
> print(slide)
> }
> 
> #Function#2:
> remove.func<-function(data,Name){
> Name<-as.character(data[,1])
> indexZZ<-grep("ZZ",Name,value=FALSE)
> data<-data[!indexZZ,] #doesn't work, give an empty dataframe
Please read the manuals and learn how to index:

  data <- data[-indexZZ,]

Uwe Ligges

> print(slide)
> }
> 
> Thanks :|
> 
> Nolwenn Le Meur
> 
> ********************************************
> Nolwenn Le Meur
> INSERM U533
> Facult? de m?decine
> 1, rue Gaston Veil
> 44035 Nantes Cedex 1
> France
> 
> Tel: (+33)-2-40-41-29-86 (office)
>      (+33)-2-40-41-28-44 (secretary)
> Fax: (+33)-2-40-41-29-50
> mail: nolwenn.lemeur at nantes.inserm.fr
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help