[R] Access Rows in a Data Frame by Row Name

[Tony Plate]

Matrix-style indexing works for both columns and rows of data frames.

E.g.:
 > x <- data.frame(a=1:5, b=6:10, d=11:15)
 > x
   a  b  d
1 1  6 11
2 2  7 12
3 3  8 13
4 4  9 14
5 5 10 15
 > x[2:4,c(1,3)]
   a  d
2 2 12
3 3 13
4 4 14
 >

Time spend reading the help document "An Introduction to R" will 
probably be well worth it.  The relevant sections are "5 Arrays and 
matrices", and "6.3 Data frames".

-- Tony Plate

Michael Gormley wrote:
> I have created a data frame using the read.table command.  I want to be able to access the rows by the row name, or a vector of row names. I know that you can access columns by using the data.frame.name$col.name.  Is there a way to access row names in a similar manner?
> 
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