[R] indexing an array
siim@obs.ee
siim at obs.ee
Thu Sep 20 09:57:15 CEST 2001
Dear everybody,
I have a following problem. I have a 3D array
lambda <- array( dim=c(N,M,M-1))
where I have to extract the elements as follows:
lambda[ 1, state[1], 1]
lambda[ 1, state[1], 2]
...
lambda[ 1, state[1], M-1]
lambda[ 2, state[2], 1]
...
lambda[ 2, state[2], M-1]
...
lambda[ N, state[N], M-1]
i.e. the result should be a 2D array, where the second index follows the
first one and the third is free (lambda[i,state[i],]). The process is
to be repeated so I do not want to write a cycle.
Any suggestions?
Thanks in advance,
Ott Toomet
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