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Function: Multi Dimension Indexer

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Description:
A Function that returns the flat index of a N dimensions array.

Inputs:
_indices: Array containing dimension indices.¹
_limits: Array containing dimension size.¹

Note:
¹: _indices and _limits size must match. indices must be within dimension size.

Outputs:
_offset: the flat 1D index.

Resources:
eli.thegreenplace.net/2015/memory-layout-of-multi-dimensional-arrays
版本注释
added functions for 2d/3d for lightweight indexing, better examples.
版本注释
removed some extra redundant stuff.

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