[R] Converting a Matrix to a Vector
Ken-JP
kfmfe04 at gmail.com
Wed Mar 25 08:13:48 CET 2009
Say I have:
> set.seed( 1 )
> m <- matrix( runif(5^2), nrow=5, dimnames = list( c("A","B","C","D","E"),
> c("O","P","Q","R","S") ) )
> m
O P Q R S
A 0.2655087 0.89838968 0.2059746 0.4976992 0.9347052
B 0.3721239 0.94467527 0.1765568 0.7176185 0.2121425
C 0.5728534 0.66079779 0.6870228 0.9919061 0.6516738
D 0.9082078 0.62911404 0.3841037 0.3800352 0.1255551
E 0.2016819 0.06178627 0.7698414 0.7774452 0.2672207
-------------------------------------------------------------------------------------------
I want to create a vector v from matrix m that looks like this:
A.O 0.2655087
B.O 0.3721239
v <- as.vector( m ) almost gives me what I want, but then I need to take
combinations of colnames( m ) and rownames( m ) to get my labels and hope
they match up in order: if not, manipulate the order. This approach feels
kludgy...
Is this the right approach or is there a better way?
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