Hi all,
I've been trying to work out how to slice an array of arbitrary
dimension. I found a message showing how to stick two arrays together,
but so far have been unable to transform that into what I need. Assume
that I have a four dimensional array for example:
array4d
, , 1, 1
[,1] [,2]
[1,] 3 6
[2,] 1 1
, , 2, 1
[,1] [,2]
[1,] 4 7
[2,] 8 7
, , 1, 2
[,1] [,2]
[1,] 7 8
[2,] 8 7
, , 2, 2
[,1] [,2]
[1,] 7 5
[2,] 9 9
I want to slice the array from the rightmost dimension, getting in sequence:
array4d[,,,1]
array4d[,,,2]
then slicing those 3D arrays, and so on. I'm pretty sure that this will
involve a:
do.call('[',...)
construction, but I haven't been able to work out how to specify the
list of arguments, in particular the index vector, to slice up the last
dimension. I have tried constructing index vectors with NULLs which of
course doesn't work because they just disappear. Any suggestions?
Jim
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