[R] naming rows/columns in 'array of matrices'
Evan Cooch
evan.cooch at gmail.com
Fri Jan 30 20:07:34 CET 2015
Suppose I have the following situation:
I have an array of 2 matrices, where each matrix is (2x2):
P <- array(0, c(2,2,2))
P[,,1] <- matrix(c(1,2,3,4),2,2,byrow=T);
P[,,2] <- matrix(c(5,6,7,8),2,2,byrow=T);
I want to label rows and columns of each matrix in the array, such that
P would look like
live dead
live 1 2
dead 3 4
, , 2
live dead
live 5 6
dead 7 8
I've tried 'direct, brute force" approaches like
rownames(P[,,1]) <- c("live","dead")
colnames(P[,,1]) <- c("live","dead")
(repeated for the second matrix), but this doesn't work.
Since all of the matrices are of the same dimension(s), and since I want
the same rownames and colnames for each matrix, I'm hoping there is some
simply magical permutation of lapply (I'm guessing) which will do the trick.
I'd also be interested in why the 'direct, brute force' approach
(above) doesn't work, and what does, since I might need to manipulate
row/col names for individual matrices in the array (if, say, dimensions
of the matrices were not the same over the array).
Thanks in advance!
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