[R] how to get the row name?

[Leaf Sun]

Hi R-listers,

I have a simple question about a data frame.  

I sorted a data set by one of the variable in some condition (eg. X>=0),  the followed is part of the achieved. I was wondering how can I get the row name, i. e.   (1202,  2077 , 2328,  3341,...  ) and save them as a vector.     Thanks!

			  Tag  Species     X     Y Dbh3 Recr4 mort slope elevation aspect    SA   SR     dist1     dist2     dist3
1202    19103     316 856.0 430.3   21     4    1  9.87    151.42  60.08 25.38 1.02 0.2236068 0.7211103 1.3601471
2077    29893     316 935.4 482.7   28     4    1  5.66    137.28  13.86 25.14 1.01 0.6403124 0.8944272 1.0630146
2328    32989     316 910.7 301.5   12     4    1  8.07    137.69  86.16 25.26 1.01 0.3000000 1.2806248 1.3038405
3341    45198     316 975.2   2.4  144     4    1  2.95    121.10 173.60  0.00 0.00 0.5656854 1.2727922 1.3416408
...

Regards,

Leaf