| Description: |
"MathematicaToSliIndex" converts Mathematica-like indices
to SLI indices.
For an array of size N, valid SLI indices are in the range 0..N-1
while valid Matematica indices are in the range -N..-1, 1..N
(negative indices indicating backward indexing from the end of the
array).
The given array is left untouched, solely its length is taken to
correctly map negative Mathematica indices to the correct SLI
indices.
Alternatives: Function MathematicaToSliIndex_i if index is a
number (example 1) and MathematicaToSliIndex_a if index is an
array (example 2) (both undocumented) -> behaviour and synopsis are
the same.
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