elseif requires a expression after it, but you coded an assignment.
You just want else not elseif
Remember that
if Results(2,:) == Results(3,:)
is going to test all of row 2 against all of row 3, creating a logical vector of true and false. if and while consider a test to be true only if all of the values being tested are non-zero, so the code you wrote is equivalent to
if all(Results(2,:) == Results(3,:))
which is not what you want.
What you really need to do is read about logical indexing. https://blogs.mathworks.com/loren/2013/02/20/logical-indexing-multiple-conditions/
