R help - Jun 2008 - reset row numbers when extracting a subset of a table

Hi

I created a new table by extracting only certain rows of table, but the row
numbers in my new table correspond to those from the original table. Is there a
way to reset the row numbers in my new table so that they start from one? like
below:

my table:
    COL1   COL2
17   v      45
18   b      14
25   x      98

desired:
   COL1   COL2
1   v      45
2   b      14
3   x      98

Thank you!
-Nina

Nina, these are not row NUMBERS, but row NAMES. Numbers are actually 
reset, they always start with 1 and they are continuous. Just try
doing 

T[1,]

on your table. If you want to reset row names, you can do this: 

rownames(T) <- seq(length=nrow(T))

or you can even remove them:

rownames(T) <- NULL

Best,
Gabor

On Tue, Jun 24, 2008 at 11:23:56AM -0400, naw3 at duke.edu
wrote:
> Hi
> 
> I created a new table by extracting only certain rows of table, but the row
> numbers in my new table correspond to those from the original table. Is
there a
> way to reset the row numbers in my new table so that they start from one?
like
> below:
> 
> my table:
>     COL1   COL2
> 17   v      45
> 18   b      14
> 25   x      98
> 
> desired:
>    COL1   COL2
> 1   v      45
> 2   b      14
> 3   x      98
> 
> Thank you!
> -Nina
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
-- 
Csardi Gabor <csardi at rmki.kfki.hu>    UNIL DGM

I assume that by table you mean data frame.  Using the built in
data frame, BOD, try this:
> ix <- 2:4
> BOD[ix, ]
  Time demand
2    2   10.3
3    3   19.0
4    4   16.0
> data.frame(BOD[ix, ], row.names = seq_along(ix))
  Time demand
1    2   10.3
2    3   19.0
3    4   16.0


On Tue, Jun 24, 2008 at 11:23 AM,  <naw3 at duke.edu>
wrote:
> Hi
>
> I created a new table by extracting only certain rows of table, but the row
> numbers in my new table correspond to those from the original table. Is
there a
> way to reset the row numbers in my new table so that they start from one?
like
> below:
>
> my table:
>    COL1   COL2
> 17   v      45
> 18   b      14
> 25   x      98
>
> desired:
>   COL1   COL2
> 1   v      45
> 2   b      14
> 3   x      98
>
> Thank you!
> -Nina
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>