Accessing Arbitrary Dimensions

[dbateman]

I've dealt with pretty much the same issue in the past. The sub2ind method is
slow and not that flexible. I prefer two different solutions 

1) Create a cell array of the correct dimensionality like

idx = cell(ndim, 1)
for i = 1, ndim
  idx {i} = ":";
endfor
idx{dim} = ??;

where ?? is replaced with whatever you want to replace it with to act of the
dimension required. Then you can convert to a cs-list to use it as an index
like x(idx{:}).

2) use permute/ipermute to more the desired dimension to be the first
dimension and then treat the indexing as 2-D (even if the matrix is ND) and
then permute back

D.
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