Really a newbe Q about data.frames

Hi all (again)

Sorry to bother you with this lame question, but since I have not been
able to find the answer in the manuals..
How do I change the name of a variable in a data.frame??
(Without copying hte entire fram to another one of course..)

via names:

DF <- data.frame(a=1, b=2)
names(DF)[2] <- "bb"
DF
  a bb
1 1  2

(Actually, that does make a copy internally).

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 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Is there a simple way of removing variables from a dataframe?

- rm(dataframe$VAR) doesn't seem to work
- Copying all but the unwanted variables into a new data frame is awkward
when there are a lot of variables.
- I haven't found any references to this in the help files.


Stuart
Dr Stuart Leask MA MRCPsych, Clinical Lecturer in Psychiatry
University of Nottingham Dept of Psychiatry, Duncan Macmillan House
Porchester Road, Nottingham. NG3 6AA. UK
http://www.nottingham.ac.uk/psychiatry/staff/sjl.html

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%Is there a simple way of removing variables from a dataframe?
%
%- rm(dataframe$VAR) doesn't seem to work
%- Copying all but the unwanted variables into a new data frame is awkward
%when there are a lot of variables.
%- I haven't found any references to this in the help files.

dataframe$VAR<-NULL

%
%
%Stuart
%Dr Stuart Leask MA MRCPsych, Clinical Lecturer in Psychiatry
%University of Nottingham Dept of Psychiatry, Duncan Macmillan House
%Porchester Road, Nottingham. NG3 6AA. UK
%http://www.nottingham.ac.uk/psychiatry/staff/sjl.html
%
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%

***********************************************************************
Jens Nieschulze

Institute for Forest Biometrics &	Phone: ++49-551-39-12107
Applied Computer Science		Fax  : ++49-551-39-3465
Buesgenweg 4
37077 Goettingen		E-mail: jniesch at uni-forst.gwdg.de
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Hello there.

I have a script (see below) that runs in Rv1.4.0  for windows, but not in
Rv1.4.0 for linux (not the current versions, I know, but close).

In the linux version, the script is interrupted by a prompt
"Display all 101 possibilities? (y or n)"
that stops the script working properly. This prompt doesn't appear when
running the script in R for windows.

Is there some way of turning this prompt off so that I can run this script
in the linux version?

Stuart

Dr Stuart Leask MA MRCPsych, Clinical Lecturer in Psychiatry
University of Nottingham Dept of Psychiatry, Duncan Macmillan House
Porchester Road, Nottingham. NG3 6AA. UK
http://www.nottingham.ac.uk/psychiatry/staff/sjl.html

Linux version console:

...

plot(RB,R)
i<-0
while(i<30){

+ Ri<-lag(R,i)
+ L0<-lag(L,0)
+ M<-as.data.frame(ts.intersect(Ri,L0))
+ cor.i<-cor(M$Ri,M$L0)
+ if(abs(cor.i)<0.01)
+ {
+ RBi<-100*(M$Ri-M$L0)/M$Ri+M$L0)
+
Display all 101 possibilities? (y or n)
+ es(lowess(RBi,M$Ri))
+ }
+ i<-i+1
+ }
Error: couldn't find function "es"

points(lowess(RB,R))

...

Windows version console (no prompt, so all runs smoothly):

...

plot(XY)
i<-0
while(i<30){

+  Ri<-lag(R,i)
+  L0<-lag(L,0)
+  M<-as.data.frame(ts.intersect(Ri,L0))
+  cor.i<-cor(M$Ri,M$L0)
+  if(abs(cor.i)<0.01)
+  {
+  RBi<-100*(M$Ri-M$L0)/(M$Ri+M$L0)
+   lines(lowess(RBi,M$Ri))
+  }
+  i<-i+1
+ }

points(lowess(RB,R))

...

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Is there a simple way of removing variables from a dataframe?

- rm(dataframe$VAR) doesn't seem to work
- Copying all but the unwanted variables into a new data frame is awkward
when there are a lot of variables.
- I haven't found any references to this in the help files.

dataframe$VAR <- NULL

G?ran

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Fredrik Karlsson <fredrik.karlsson at ling.umu.se> writes:

Hi all (again)

Sorry to bother you with this lame question, but since I have not been
able to find the answer in the manuals..
How do I change the name of a variable in a data.frame??
(Without copying hte entire fram to another one of course..)

Use names().

Mark

--
Mark Myatt


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"Stuart Leask" <stuart.leask at nottingham.ac.uk> writes:

Hello there.

I have a script (see below) that runs in Rv1.4.0  for windows, but not in
Rv1.4.0 for linux (not the current versions, I know, but close).

In the linux version, the script is interrupted by a prompt
"Display all 101 possibilities? (y or n)"
that stops the script working properly. This prompt doesn't appear when
running the script in R for windows.

Is there some way of turning this prompt off so that I can run this script
in the linux version?

Either source() the file in or remove the TAB character that is
confusing readline.

O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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Thanks, Peter. It was that extra tab. I was baffled as to what could differ
between the two versions.

Stuart

----- Original Message -----
From: Peter Dalgaard BSA <p.dalgaard at biostat.ku.dk>
To: Stuart Leask <stuart.leask at nottingham.ac.uk>
Cc: r-help-request Mailing List <r-help at r-project.org>
Sent: Monday, February 04, 2002 11:28 AM
Subject: Re: [R] Script that runs under R(win) failing under R(linux)

"Stuart Leask" <stuart.leask at nottingham.ac.uk> writes:

Hello there.

I have a script (see below) that runs in Rv1.4.0  for windows, but not

in

Rv1.4.0 for linux (not the current versions, I know, but close).

In the linux version, the script is interrupted by a prompt
"Display all 101 possibilities? (y or n)"
that stops the script working properly. This prompt doesn't appear when
running the script in R for windows.

Is there some way of turning this prompt off so that I can run this

script

in the linux version?

Either source() the file in or remove the TAB character that is
confusing readline.

--
   O__  ---- Peter Dalgaard             Blegdamsvej 3
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907

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Send "info", "help", or "[un]subscribe"
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_._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._

Thanks to G?ran and Jens.

dataframe$VAR <- NULL

completely removes the variable.

Stuart

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