isequal(NaN, NaN) always return false. By definition Nans are not equal to each other. If you want test that a result is NaN, either use isnan, or use isequaln
The problem is unsolvable due to the second test.
I agree guys! something wrong
please use the function: isequalwithequalnans
Thanks for the suggestions. I fixed with isequalwithequalnans.
Find common elements in matrix rows
Set the array elements whose value is 13 to 0
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Sum the numbers on the main diagonal
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