Connecting like numbers in a matrix
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Suppose I have a matrix of the following data:
data = [6, 5, 3, 0, 0, 1; ...
0, 0, 0, 0, 0, 2; ...
0, 0, 0, 0, 0, 4; ...
0, 0, 0, 0, 0, 0; ...
6, 0, 0, 0, 0, 0; ...
5, 0, 4, 0, 0, 0]
What I would like to do is find the like entries that I can connect directly to by remaining on the edges of the matrix. So for instance, after applying this function I should get
newdata = [6, 5, 3, 0, 0, 1; ...
6, 0, 0, 0, 0, 2; ...
6, 0, 0, 0, 0, 4; ...
6, 0, 0, 0, 0, 4; ...
6, 0, 0, 0, 0, 4; ...
5, 0, 4, 4, 4, 4]
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