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...
First N Perfect Squares
Determine Whether an array is empty
Doubling elements in a vector
Basics: 'Find the eigenvalues of given matrix
MATLAB Basic: rounding IV
find the 'M'
Make an identity matrix whose diagonal elements are 1:n
Sum the rows
Replace all odd numbers with NaN
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