[R] read.table and factor

[Peter Dalgaard BSA]

Bill Simpson <wsi at gcal.ac.uk> writes:

> I have a data file like this:
> 
> std     cf      hit     miss    fa      cr
> 920     980     40      15      14      31
> 950     1010    24      23      23      30
> 1190    1250    26      21      27      26
> 1010    1070    33      10      28      29
> 1040    1100    35      10      11      44
> 
> I use read.table to read it in. My problem is that read.table makes std
> and cf into factors. I want them just to be ordinary numeric variables.
> 
> as.numeric(d$std) doesn't work properly (as the docs warn), and same goes
> for codes(d$std)

as.numeric(as.character()) should do it

> How can I either tell read.table to leave the first two cols as numeric
> (not factors) or convert them from factors into the proper numeric values?

If they're not read as numeric, then they must contain non-numeric
elements. Either fix the typo (!) or set na.strings in the call to
read.table. 

-- 
   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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