# How to get row from R data.frame

### Question

I have a data.frame with column headers.

How can I get a specific row from the data.frame as a list (with the column headers as keys for the list)?

Specifically, my data.frame is

```      A    B    C
1 5    4.25 4.5
2 3.5  4    2.5
3 3.25 4    4
4 4.25 4.5  2.25
5 1.5  4.5  3
```

And I want to get a row that's the equivalent of

``````> c(a=5, b=4.25, c=4.5)
a   b   c
5.0 4.25 4.5
``````
1
94
11/29/2016 6:18:54 AM

``````x[r,]
``````

where r is the row you're interested in. Try this, for example:

``````#Add your data
x <- structure(list(A = c(5,    3.5, 3.25, 4.25,  1.5 ),
B = c(4.25, 4,   4,    4.5,   4.5 ),
C = c(4.5,  2.5, 4,    2.25,  3   )
),
.Names    = c("A", "B", "C"),
class     = "data.frame",
row.names = c(NA, -5L)
)

#The vector your result should match
y<-c(A=5, B=4.25, C=4.5)

#Test that the items in the row match the vector you wanted
x[1,]==y
``````

This page (from this useful site) has good information on indexing like this.

115
5/12/2015 1:05:58 PM

Logical indexing is very R-ish. Try:

`````` x[ x\$A ==5 & x\$B==4.25 & x\$C==4.5 , ]
``````

Or:

``````subset( x, A ==5 & B==4.25 & C==4.5 )
``````