No need for finding / calculating any phi or angle here. Just simpler than it is written.
Find the numeric mean of the prime numbers in a matrix.
Replace NaNs with the number that appears to its left in the row.
Flip the main diagonal of a matrix
Find a subset that divides the vector into equal halves
The sum of the numbers in the vector
Create a square matrix of multiples
Find the "ordinary" or Euclidean distance between A and Z
How many days does the cat take to climb out of the hole?
Find the largest value in the 3D matrix
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