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...
Swap two numbers
Let's get back to school, and create multiplication tables
Change string to number
Sum positive elements of matrix.
Radians to Degrees
Where is the number that you want to find?
true or false
Replace all odd numbers with NaN
find the 'M'
Make an identity matrix whose diagonal elements are 1:n
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