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    <p>So, as you can see, you have several combinations of a zero matrix you want to add a one, right?</p> <p>We could say that you have the following possible combinations you want to add a one. For the 2 dimensional case:</p> <pre><code>addOnes = Empty matrix: 1-by-0 onePossibleCombination = 0 0 0 0 addOnes = 1 onePossibleCombination = 1 0 0 0 addOnes = 2 onePossibleCombination = 0 0 1 0 addOnes = 3 onePossibleCombination = 0 1 0 0 addOnes = 4 onePossibleCombination = 0 0 0 1 addOnes = 1 2 onePossibleCombination = 1 0 1 0 addOnes = 1 3 onePossibleCombination = 1 1 0 0 addOnes = 1 4 onePossibleCombination = 1 0 0 1 addOnes = 2 3 onePossibleCombination = 0 1 1 0 addOnes = 2 4 onePossibleCombination = 0 0 1 1 addOnes = 3 4 onePossibleCombination = 0 1 0 1 addOnes = 1 2 3 onePossibleCombination = 1 1 1 0 addOnes = 1 2 4 onePossibleCombination = 1 0 1 1 addOnes = 1 3 4 onePossibleCombination = 1 1 0 1 addOnes = 2 3 4 onePossibleCombination = 0 1 1 1 addOnes = 1 2 3 4 onePossibleCombination = 1 1 1 1 </code></pre> <p>How can we achieve that? All we need is to take all combinations taken by 0, 1, 2, 3 and 4. For that we use the <code>nchoosek</code> method as follows:</p> <pre><code>matrixSize = 2; for k=0:matrixSize^2 combinations=nchoosek(1:matrixSize^2,k); for m = 1:size(combinations,1) addOnes = combinations(m,:); onePossibleCombination = zeros(matrixSize,matrixSize); onePossibleCombination(addOnes) = 1; % Do your operation here with the matrix onePossibleCombination end end </code></pre>
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    1. COThank you very much for your time and help Werner, that is exactly what I needed. I'd never heard of the addOnes command (I'm trying to teach myself MatLab).
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    2. CO@Jack There is no such command `addOnes`. The command I used is called `nchoosek`. `addOnes` is just a variable x), which, in fact, is only a column from the `combinations` variable that was the **output argument** from `nchoosek`.
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    3. CO@Jack don't forget to accept your answer and be welcome here.
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