MATLAB: How to find patterns in an array

MATLAB

Hello
I have a 19*19 array filled with either a 1, -1 or a 0.
I need to find patterns of 5 repeating values next to each other of any value in both row and columns, and then store where the patterns are in an array.
example:
[1 0 0 0 0 0 1 0 -1 ]
and then store where the patterns are in another 19*19 array. As either a row pattern, column pattern or both.
any suggestions on how to do it? I'm completely lost.

Best Answer

A loop is probably the simplest and clearest way to do it:
A = randi(3, 20) - 2; %for demo
patternlength = 5;   
pl = patternlength - 1; %actually more useful than patternlength
positions = zeros(size(A)) %output matrix
for col = 1:size(A, 2) - pl
  for row = 1:size(A, 1)- pl
    if all(diff(A(row:row+pl, col)) == 0) || all(diff(A(row, col:col+pl)) == 0)
      positions(row, col) = 1;
    end
  end
end
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