Re: subarray(x, d, k) for picking all k-th elements of d-th dimension of x ?

[Francesco Potorti`]

>> Very often I would need a function subarray(x, d, k) that picks, for integers
>> d and k, from an array x all k-th elements at dimension d:
>>
>> y = subarray(x, d, k)   <=>   y = x(:,...,:,k,:,...,:)
>>
>> where k is at position d.

>idx = {':'}(ones (1, max (ndims (x), d))); idx{d} = k; % or anything
>y = x(idx{:});

I used:

  allidx = num2cell(repmat(":",1,ndim));
  subidx = allidx; subidx{d} = k;
  sub = b(subidx{:});

And yes, technically this is all documented (I learnt it from the docs)
but it is very terse and often cryptic.  Yes, more examples would be
very useful.  I have plans for writing some, but I have too many plans...

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