Remove consecutive duplicates from matrix

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Simon Meyer
Simon Meyer 2020-11-26
评论： Ameer Hamza 2020-11-30
Hello,
i need to remove duplicates form my matrix, but only if they are consecutive duplicates.
Lets suppose i have the following list of coordinates in a matrix, with for example x, y and z coordinates, that is describing a path.
A=[ 1, 0, 3
2, 1, 3
2, 1, 3
2, 2, 3
1, 0, 3]
Now, you can see that the point [2, 1, 3] is a consecutive duplicate, that I want to remove (because it's unuseful information).
But I do not want to remove the (duplicate) row at the end, [1, 0, 3], even if this row is already there in the beginning.
Also, the sorting shouldn't be changed. The desired output should be
A=[ 1, 0, 3
2, 1, 3
2, 2, 3
1, 0, 3]
I cannot use 'unique' for that, because that would filter also the last line.
What is the smartest way to do that?
Thank you very much for your help!

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Ameer Hamza
Ameer Hamza 2020-11-26
Try this
A=[ 1, 0, 3
2, 1, 3
2, 1, 3
2, 2, 3
1, 0, 3];
idx = find(~any(diff(A), 2))+1;
A(idx, :) = [];
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