index in statistics/base/center.m ???

[CdeMills]

Hello,

The computation in said file goes around:
      mx = sum (x, dim) / n;
      idx(1:ndims (x)) = {':'}; 
      idx{dim} = ones (1, n);
      retval = x - mx(idx{:});

could someone point me to the documentation of the logic behind this index
access ? The purpose is to reconstruct a matrix with the same size as x ?
Can it be directly translated in terms of the S matrix used in subsref and
subsagn ?

TIA

Pascal
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