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a(:,:,3) =
3 3 3
3 3 3
3 3 3
Indexing for multidimensional arrays works in the same way as two-
dimensional arrays;
>> a(2,:,1)
ans =
4 5 6
>> a(2,:,2)
ans =
8 10 12
>> a(2,:,:)
ans(:,:,1) =
4 5 6
ans(:,:,2) =
8 10 12
ans(:,:,3) =
3 3 3
Data can be removed from multidimensional arrays by using the empty
matrix:

>> a(:,:,2) = []
a(:,:,1) =
1 2 3
4 5 6
7 8 9
a(:,:,2) =
3 3 3
3 3 3
3 3 3
Elements can be columnarly extracted from multidimensional arrays in
the same way as they are from two-dimensional arrays:
>> a(:)’
ans =
Columns 1 through 12
1 4 7 2 5 8 3 6 9 3 3 3
Columns 13through 18
3 3 3 3 3 3

29.1 Generating Multidimensional Grids
The function meshgrid can be used to create matrices representing
evenly-spaced grids of points.

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