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...
Getting logical indexes
Make a random, non-repeating vector.
Basics: 'Find the eigenvalues of given matrix
find the 'M'
Make an identity matrix whose diagonal elements are 1:n
Where is the number that you want to find?
Replace all odd numbers with NaN
Sum the rows
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