R help - Apr 2008 - Adding rownames with different lengths to a table

Hello! I would like to add names to a table. The table presents median values,
numbers of values (n) and percentage(%) for a given agegroup. Thus I would like
to add a label above these three variables for each category. But if I try to
use colnames I get a message telling me that the number of labels must be equal
to the number of columns in the table. I hope someone could understand what I
mean!

	[[alternative HTML version deleted]]

filip rendel <filip61 at hotmail.com> wrote in
news:BAY129-W482E25FE18F0FBDA8C7346B2DF0 at phx.gbl: 
> 
> Hello! I would like to add names to a table. The table presents
> median values, numbers of values (n) and percentage(%) for a given
> agegroup. Thus I would like to add a label above these three
> variables for each category. But if I try to use colnames I get a
> message telling me that the number of labels must be equal to the
> number of columns in the table. I hope someone could understand what
> I mean! 
> 
>      [[alternative HTML version deleted]]
You can use indexing and I had better luck with names(), e.g.:

names(df)[5] <- "var.median"

----example
> table(rpois(100,5))
 1  2  3  4  5  6  7  8  9 10 11 
 6  6  5 21 17 18 12  5  7  2  1 
> xp <-  table(rpois(100,5))
> class(xp)
[1] "table"
> names(xp)[5] <- "mode"
> xp
   1    2    3    4 mode    6    7    8    9   10   11 
   5   10   15   16   19   12    8    6    6    2    1 

#--colnames appears not to work for this class---
> colnames(xp)[4] <- "four"
Error in dn[[2]] : subscript out of bounds

I would have thought that a table object was a "matrix-like object", 
but I may be confusing the R definitions of arrays and matrices.


-- 
David Winsemius