How to create a random 3D matrix?

Question

Is there any way of creating a 3D matrix randomly? There are ways to create random 2D matrices using randint function. Is there any inbuilt function like that?

E.g.

Answer 1

If you read the help carefully, you will notice that the randi function accepts any number of dimensions. You may do randi(10,3,3,3)

randi(10,3,3,3)

ans(:,:,1) =

     9    10     3
    10     7     6
     2     1    10


ans(:,:,2) =

    10    10     2
     2     5     5
    10     9    10


ans(:,:,3) =

     8     1     7
    10     9     8
     7    10     8

Answer 2

You can use randi(imax, size1, size2, size3) function where imax refers to maximum of random integer values (mean upper bound) and 1 is lower bound. You can expand size argument to sizeN what you want.

This is an example of its usage:

>> A = randi(5, 4, 4, 3)

A(:,:,1) =

     4     4     5     4
     4     1     2     2
     2     1     3     3
     4     3     2     4


A(:,:,2) =

     5     1     5     1
     5     2     2     2
     3     5     5     4
     1     2     2     3


A(:,:,3) =

     2     5     2     3
     5     2     3     4
     3     4     1     5
     3     4     1     1