Remove duplicates in first 2 dimension in a matrix, matlab?

That can be easily and efficiently done with accumarray.

Scan your first 2 rows and insert the elements into a max-heap. While inserting, you can check on the fly if the element already exists (don't insert it into the heap in this case). If it exists, compare it with current maximum and set as maximum if needed.

The final maximum is the result you seek.

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