Given a input vector x, return y as index-powered vector as shown below.
x = [2 3 6 9]
then y should be
[2^1 3^2 6^3 9^4] = [2 9 216 6561]
Angle between two vectors
Make a random, non-repeating vector.
Create incrementing array
Replacing a row
Find offset of given matrix element from first matrix element
Matrix multiplication across rows
Find my birthday
Create a v-notch vector without "sort" function
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