I need to generate all 0/1 matrices

Question

andreas 2013-7-2

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https://ww2.mathworks.cn/matlabcentral/answers/80893-i-need-to-generate-all-0-1-matrices

采纳的回答： Walter Roberson

Hi, i would like to generate all different 5x5 triangle matrices which just have 0 and 1 as elements.

It's important that i really get all and not just a lot.

Is there a command for it? If not how can i programm it?

I appreciate your help a lot.

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Jan 2013-7-3

See the newer question: http://www.mathworks.com/matlabcentral/answers/80944-how-to-save-matrices-which-i-created-in-a-for-loop

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Answer 1

Walter Roberson 2013-7-2

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在 MATLAB Online 中打开

M = dec2bin(0:2^15-1, 15);

Now each row of M is the content of one triangular matrix, but in linear form. You can pre-construct the linear indices of the triangular matrix you want (upper or lower), and go through assigning through those indices in turn.

Here is a constructor:

AllTriang = arrayfun( @(N) subsassgn(zeros(5,5), struct('type', '()', 'subs', {[1:5 7:10 13:15 19:20 25]}), dec2bin(S, 15)), 0:2^15-1, 'Uniform', 0);

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Walter Roberson 2013-7-3

在 MATLAB Online 中打开

AllTriang = arrayfun( @(N) subsasgn(zeros(5,5), struct('type', '()', 'subs', {{[1:5 7:10 13:15 19:20 25]}}), dec2bin(N, 15)-'0'), 0:2^15-1, 'Uniform', 0);

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Answer 2

Kevin 2013-7-2

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编辑：Kevin 2013-7-2

在 MATLAB Online 中打开

 %This will flip through the linear indexes of a matrix and turn each value into    % a binary one
A = rand(5)
for p=1:end
    if A(p)<=.5
        A(p)= 0
    else 
        A(p)=1
    end
end

Edit: triu(A) and tril(A) return the upper and lower triangular portions of A, respectively. Tack that onto my previous post and you should be all set.

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Answer 3

andreas 2013-7-2

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https://ww2.mathworks.cn/matlabcentral/answers/80893-i-need-to-generate-all-0-1-matrices#answer_90637

Thank you Walter. The first part is a really great tip. Unfortunately i am not able to get the 2nd part going. Do you have the whole file avaiable for it?

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Jan 2013-7-3

@andreas: Please post comments to an answer in the corresponding comment section and explain "not able to get going" with details: EDo you get an error message? If so, which one?

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