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Create matrix indicating combinations of dummy variables

Asked by Zhenyu Yao on 19 Sep 2019
Latest activity Edited by James Tursa
on 19 Sep 2019
I have eight dummy variables (0-1 variables). I need to find all the possible combinations of these variables.
For example, v1-v8 are 0-1 variables and I want to the following result.
[0 0 0 0 0 0 0 0;
1 0 0 0 0 0 0 0;
0 1 0 0 0 0 0 0;
0 0 1 0 0 0 0 0;
0 0 0 1 0 0 0 0;
......
1 1 1 1 1 1 1 1]
Therefore, this matrix should be a 256*8 matrix.
I am very new to MATLAB and do not know how to generate matrix using loop. Thanks for help!

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1 Answer

Answer by James Tursa
on 19 Sep 2019
Edited by James Tursa
on 19 Sep 2019
 Accepted Answer

Variations of this technique are often used, but this can exceed your memory if n gets too large:
n = 8;
result = dec2bin(0:2^n-1) - '0'; % the - '0' turns the dec2bin result into a double

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