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# dim(?Term, ?Dimensions)

Creates a multi-dimensional array in the form of nested structures, or computes the dimensions of an existing matrix.
Term
Variable or structure.
Dimensions
Variable or list of integers.

## Description

Creates a multi-dimensional array in the form of nested structures, or computes the dimensions of an existing matrix.

When creating an array of dimensions [D1,..,Dn], a nested structure is created with the top-level term having the functor []/D1, its arguments being structures with functor []/D2, and so on. The functor [] is chosen to remind of arrays, but is otherwise not significant.

To get the size of one-dimensional arrays, it is more efficient to use arity/2.

### Modes and Determinism

• dim(+, -) is det
• dim(-, ++) is det

### Exceptions

(4) instantiation fault
Both Term and Dimensions are not sufficiently instantiated.
(5) type error
Dimensions is not a list of integers.

## Examples

```[eclipse]: dim(M,[3,4]), dim(M,L).
M = []([](_131, _132, _133, _134),
[](_126, _127, _128, _129),
[](_121, _122, _123, _124))
L = [3, 4]
yes.

```