[R] dataframes with only one variable

[TEMPL Matthias]

> Subsetting from a dataframe with only one variable
> returns a vector, not a dataframe.
> This seems somewhat inconsistent.
> Wouldn't it be better if subsetting would respect
> the structure completely?
> 
> 
> v1<-1:4
> v2<-4:1
> df1<-data.frame(v1)
> df2<-data.frame(v1,v2)
> sel1<-c(TRUE,TRUE,TRUE,TRUE)
> 
> > df1[sel1,]


df1[[sel1, , drop=FALSE]

Should do what you want.

Best,
Matthias

> [1] 1 2 3 4
> > df2[sel1,]
>   v1 v2
> 1  1  4
> 2  2  3
> 3  3  2
> 4  4  1
> 
> -- 
> Erich Neuwirth
> Institute for Scientific Computing and
> Didactic Center for Computer Science
> University of Vienna
> phone: +43-1-4277-39464  fax: +43-1-4277-39459
> 
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