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Examining entries in binary matrices and creating new group matrix based on % of connections (defined by 1)

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RC on 21 Mar 2018
Answered: Christine Tobler on 21 Mar 2018
Hi MATLAB users,
I am a newbie at MATLAB and am trying to run some analyses related to graph theory. I have multiple binary matrices (each 125x125) and would like to create a new 'group' binary matrix based on examining each entry in every matrix and determining if a connection, as defined by '1' in each entry, is present in 75% of all of matrices.
What is the best way I can go about doing this? Any code suggestions would be extremely helpful!
Thanks very much!

Answers (1)

Christine Tobler
Christine Tobler on 21 Mar 2018
If you have each matrix stored in a separate variable, you can do
Atotal = A1 + A2 + A3; % Sum of logical matrices is a numeric matrix
Atotal = (Atotal/3 > 0.75) ; % Create a logical matrix where each entry is true if >75%
% of matrices have an entry that is true
If you have many matrices, it may be easier to store them all in a 3-D array of size 125-by-125-by-numMatrices. Then, the computation you describe can be done like this:
Atotal = sum(A, 3);
Atotal = (Atotal/size(A, 3) > 0.75);

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