This appears to be duplicating an error in the original Problem: according to the problem specification, having an input of  should yield a result of "false", as there is no OTHER element to compare the 1 to! You can easily fix this inconsistency by either --- changing your problem specification (mention that you can compare to all vector elements, not just the 'other' elements) or --- by changing the correct result to "false" in your Test Suite.
Please check comments made about the original Problem to avoid duplicating errors or inconsistencies.
Determine whether a vector is monotonically increasing
convert matrix to single column
Find the Oldest Person in a Room
NaN (欠損値) が含まれている行を削除しよう
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