R devel - Dec 2001 - question

Isn't anything in a data frame that is not explicitly numeric a *factor*?  

-Greg

 >  -----Original Message-----
 >  From: Peter Dalgaard BSA [mailto:p.dalgaard@biostat.ku.dk]
 >  Sent: Friday, December 07, 2001 5:32 PM
 >  To: Erich Neuwirth
 >  Cc: r-devel@stat.math.ethz.ch
 >  Subject: Re: [Rd] question
 >  
 >  
 >  Erich Neuwirth <erich.neuwirth@univie.ac.at> writes:
 >  
 >  > in r 1.3.1,
 >  > i read in data into a dataframe and (erroneously) forgot 
 >  to convert text
 >  > into numbers.
 >  > 
 >  > the frame was called olddata
 >  > then i could to the following calculation:
 >  > 
 >  > vp95<-olddata["vp95"]/olddata["wb95"]
 >  > 
 >  > "vp95" and "wb95" are column names.
 >  > 
 >  > in r 1.4.0, this does not work any more.
 >  > i have to do
 >  > 
 >  >
vp95<-as.real(olddata[,"vp95"])/as.real(olddata[,"wb95"])
 >  > 
 >  > is this intended behavior now?
 >  
 >  Eh? Could you give an example of how to create such a data 
 >  frame? The
 >  things I can think up give the same in both versions?
 >  
 >  -- 
 >     O__  ---- Peter Dalgaard             Blegdamsvej 3  
 >    c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 >   (*) \(*) -- University of Copenhagen   Denmark      Ph: 
 >  (+45) 35327918
 >  ~~~~~~~~~~ - (p.dalgaard@biostat.ku.dk)             FAX: 
 >  (+45) 35327907
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On Fri, 7 Dec 2001, Warnes, Gregory R wrote:
>
> Isn't anything in a data frame that is not explicitly numeric a
*factor*?
No.  You can have columns of just about any type in a data frame,
including logical, complex, character, POSIXt, ....

In (pre-)1.4.0 read.table will generate these for you much more often (and
more easily).

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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here is the example

this is how i read my data

assign("oldfilename","d:\\documents\\wahl99\\nrw95testin.csv",envir=.GlobalEnv)
olddata<-read.csv(oldfilename,as.is=TRUE,sep=";",header=FALSE,
col.names=c("nr","name","wb95","abg95","glt95",
       
"sp95","vp95","fp95","gr95","lif95"))


when i then compute
olddata["sp95"]/olddata["wb95"]

r 1.3.1 is ok,
and r 1.4.0 says

Error in FUN(left, right) : non-numeric argument to binary operator




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