Implicit index
Implicit index (also known as a null-index) is an index that does not have a name.
Because it has no name, there is no way to refer to it in expressions where index parameters are expected. Most built-in Analytica functions can still be employed to operate over implicit indexes.
To avoid ambiguity, Analytica does not allow more than one implicit index in an array. If you try to combine multiple arrays with implicit indexes, it will cause an error.
When an implicit index reaches the top level of an expression, it is promoted to be a Self index.
Implicit indexes define implicit dimensions, e.g. (-3..3) or [-3, -2, -1, 0, 1, 2, 3].
Indexes that do have a name, are called explicit indexes and define explicit dimensions, e.g. Index I := 1..10
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