How to make a 3D Matrix

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Nicholas Deosaran
Nicholas Deosaran on 3 Sep 2020
Edited: Jon on 14 Sep 2020
How to make a 3D Matrix that contains all ones in the first layer, all twos in the second layer and all threes in the third layer?

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Accepted Answer

Jon on 3 Sep 2020
Edited: Jon on 3 Sep 2020
You can also do it like this, for example for a 2 by 4 by 3
A = ones(2,4,3).*reshape(1:3,1,1,3)
Jon on 14 Sep 2020
Edited: Jon on 14 Sep 2020
You asked about what the reshape function does.
The reshape(1:3,1,1,3) The first argument 1:3 makes a 3 element row vector with elements [1, 2, 3]the second, third and fourth arguments specify that we want to turn this row vector into a 1 row, by 1 column, by 3 "page" array. So 1 goes in the 1,1,1 location of the first page, 2 goes into th 1,1,2 location on the second page and 3 goes into the 1,1,3 location on the third page. By shaping it this way the array dimension for the multiplication
Also type doc reshape on the command line to get documentation on the reshape function for further details

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