[R] two bugs ?

[Peter Dalgaard BSA]

"ken_lee" <ken_lee at tynesys.com> writes:

> Dear,
>        I thought these two example are bugs. 
> example 1:  colnames issue
>  > tmp<-data.frame(value=1:3,group1=1:3)     
>  > if (length(tmp$group)>1) z<-1 else z<-2
>  > print(z)
> 
>    [1] 1


tmp$group is 1:3 because of partial matching in "$" (which is not a
bug, but maybe a design infelicity). 
 
> example2 :  length issue
> > tmp<-data.frame(value=1:3,group=c("a","a","b")  )
> > tmp1<-gsummary(tmp,FUN=length,groups=tmp$group)
> > tmp1
>   value group
> a     2     a
> b     1     b
> 
> > tmp<-data.frame(value=1:3,group=c("a","c","b"))  
> > tmp1<-gsummary(tmp,FUN=length,groups=tmp$group)
> > tmp1
>   value group
> a     1     a
> b     3     b
> c     2     c

That's how gsummary (from nlme) works. Look at the definition of FUN.

-- 
   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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