[R] dataframes with only one variable

[Erich Neuwirth]

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,]
[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