find the first elements of a column matrix
This would be better as "find the nth element of an array." Also, a column matrix doesn't exist. Perhaps you meant column vector, though the variables in your test cases are row vectors.
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Basics: Divide integers to get integer outputs in all cases
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Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
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