[R] CoDA DataFrame: Change Column to Row Name

[Rich Shepard]

   I recall reading how to do this somewhere, but I cannot find just where I
read it. I have compositional data frames of this format:

     sampdate filter gather  graze predate  shred
1 2000-07-18 0.0550 0.5596 0.0734  0.2294 0.0826
2 2003-07-08 0.0734 0.6147 0.0183  0.2294 0.0642
3 2005-07-13 0.1161 0.5714 0.0357  0.1696 0.1071
4 2006-06-28 0.1000 0.4667 0.1500  0.1333 0.1500
5 2010-09-14 0.0778 0.6111 0.0444  0.1889 0.0778
6 2011-07-13 0.0879 0.5714 0.0659  0.2747 0.0000
7 2012-07-11 0.1042 0.5313 0.0625  0.2396 0.0625

and the sampdate column should be the row headings rather than the numeric
sequence seen above. What is the command to move the sampdates to row
headers?

Rich