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ListVector—Wolfram Documentation

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"ListVector"::[type]

represents a uniform list with the specified element type.

• "ListVector" can be used in Typed and related constructs to specify a type.
• "ListVector" objects are automatically memory managed.
• The elements of a "ListVector" can have any compiled type.
• The elements of a "ListVector" all have the same type.
• For numerical tensors with rank greater than 1, "PackedArray" or "NumericArray" can be used.

• "ListVector" objects can be constructed with Typed[{…},"ListVector"::[type]] in compiled code. »
• CreateTypeInstance["ListVector"::[type],carr,len] constructs a "ListVector" from a "CArray" carr with length len. carr can optionally be wrapped in "Managed".

• Information[list,"ContainedType"] for list of type "ListVector"::[type] gives type.
• Information[list,"ElementType"] for list of type "ListVector"::[type] gives type.

Expressions
• List expressions can be converted to and from "ListVector"::[type] as long as every element of the list can be converted to type.
"PackedArray"
• "ListVector" objects can be converted to and from "PackedArray" objects.
"NumericArray"
• "ListVector" objects can be converted to and from "NumericArray" objects.

ArrayPartError
• Operations that require extracting elements from a "ListVector" can give a runtime error if those elements do not exist.

"ListVector" can be used as input or output for a CompiledCodeFunction:

Create a "ListVector" in compiled code:

"ListVector" objects can contain objects with any compilable type:

Higher-rank arrays can be represented with nested "ListVector" instances:

Get the element type of a "ListVector":

The "PackedArray" can be used to represent numerical arrays:

However, it cannot be used for non-numerical data:

In contrast, the "ListVector" type can only represent rank-1 lists, but it can have elements with any compilable type:

Part access can cause a runtime error:

Introduced in 2022 (13.1)

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