Create a 3-D array and determine whether the array elements are a matrix.

First define a 2-D array of size 2-by-3. Determine whether it is a matrix.

A = *2×3*
0.1000 0.2000 0.5000
0.3000 0.6000 0.4000

To create a 3-D array, add a third dimension to the array `A`

. Assign another 2-by-3 matrix to the third dimension of `A`

with index value 2.

A =
A(:,:,1) =
0.1000 0.2000 0.5000
0.3000 0.6000 0.4000
A(:,:,2) =
1 1 1
1 1 1

Check whether the 3-D array of size 2-by-3-by-2 is a matrix.

Now determine whether the array elements of `A`

are a matrix. Check whether the second page of the 3-D array is a matrix. The syntax `A(:,:,2)`

uses a colon in the first and second dimensions to access all rows and all columns.

Check whether the second row of the 3-D array is a matrix. The syntax `A(2,:,:)`

uses a colon in the second and third dimensions to include all columns and all pages.

`A(:,:,2)`

is a matrix since it is a multidimensional array of size 2-by-3. However, `A(2,:,:)`

is not a matrix since it is a multidimensional array of size 1-by-3-by-2.