make all the elements in given x zero.
Simple but fun
I'm not sure this would work if there is a 0 in x...
Check if sorted
Max of a Vector
Cumulative product of a vector
UICBioE240 problem 1.13
Flipping a Matrix
Sum the rows
Where is the number that you want to find?
find the 'M'
Make an identity matrix whose diagonal elements are 1:n
Replace all odd numbers with NaN
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