Sort complex numbers into complex conjugate pairs.
Input x = [3-6i -1-4i -1+4i 3+6i]
Sorted output = [-1 - 4i -1 + 4i 3 - 6i 3 + 6i]
Project Euler: Problem 2, Sum of even Fibonacci
Number of Circles in a Number
create a circulant matrix
Relative ratio of "1" in binary number
Change the sign of even index entries of the reversed vector
Moving average (variable kernel length)
Duplicate a character
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