Matlab initialize 3D array with a 2D array

Question

Is there a simple way to create a 3D array in which each layer is initialized with a given 2D array? I could use the following for loop, but it's very slow.

a = rand(1000);
b = zeros(1000, 1000, 1000);
for i = 1:1000
  b(:,:,i) = a;
end

If the goal is actually to initialize your array with random values, you can call rand(1000,1000,1000) — BillBokeey
– BillBokeey, Commented Nov 17, 2022 at 8:07

Wolfie · Accepted Answer · 2022-11-17 08:33:04Z

1

You can use repmat or repelem equivalently here

a = rand(10,10);

b = repmat( a, 1, 1, 1000 );
c = repelem( a, 1, 1, 1000 );

You can also use implicit expansion, although it's not as clear to read

d = a + zeros( 1, 1, 1000 );

answered Nov 17, 2022 at 8:33

Wolfie

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