find where number changes in a matrix
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I have a matrix of +1 and -1 values. I want to find where the number flips from 1 to -1 or vice versa where the change is a change from column to column.
X=[...
1 1 1 1;
1 -1 1 1;
1 1 1 -1;
1 1 1 1]
the answer should be [2,2],[2,3]and [3,4]. I tried
find(diff(X)==2);
find(diff(X)==-2);
Any help is appreciated
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