[R] data.frame into vector

[Jan Goebel]

Hi,

as other already pointed out as.matrix is what you need.
Just one comment:

as.matrix(x[1,]) 

should be much faster for larger data frames compared to

as.matrix(x)[1,]

Best 

jan


On Tue, 23 Nov 2004, Tiago R Magalhaes wrote:

> Hi
> 
> I want to extract a row from a data.frame but I want that object to 
> be a vector . After trying some different ways I end up always with a 
> data.frame or with the wrong vector. Any pointers?
> 
>  x <- data.frame(a = factor(c('a',2,'b')), b = c(4,5,6))
> I want to get
> "a" "4"
> 
> I tried:
> 
> as.vector(x[1,])
>   a b
> 1 a 4
> (resulting in a data.frame even after in my mind having coerced it 
> into a vector!)
> 
> as.vector(c[1,], numeric='character')
> [1] "2" "4"
> (almost what I want, except that "2" instead of "a" - I guess this as 
> to do with levels and factors)
> 
> Thanks for any help
> 
> > R.Version()
> $platform
> [1] "powerpc-apple-darwin6.8"
> 
> $arch
> [1] "powerpc"
> 
> $os
> [1] "darwin6.8"
> 
> $system
> [1] "powerpc, darwin6.8"
> 
> $status
> [1] ""
> 
> $major
> [1] "2"
> 
> $minor
> [1] "0.1"
> 
> $year
> [1] "2004"
> 
> $month
> [1] "11"
> 
> $day
> [1] "15"
> 
> $language
> [1] "R"
> 
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-- 
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 Jan Goebel 
 j g o e b e l @ d i w . d e

 DIW Berlin 
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 D-14195 Berlin -- Germany --
 phone: 49 30 89789-377
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