Simple but fun
I'm not sure this would work if there is a 0 in x...
Matlab Basics - Rounding II
Matlab Basics II - Count rows in a matrix
UICBioE240 problem 1.8
Basic commands - rounding
Find sum of negative elements in row.
Where is the number that you want to find?
Sum the rows
Make an identity matrix whose diagonal elements are 1:n
Replace all odd numbers with NaN
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