This should be quite straightforward but at 2a.m. my brains are not working 100%. ;)
I has exactly the same idea!!
but on the second line I used directly the logical indexing... ;-)
Back to basics 1 - Saving
Column norms of a matrix
Sum of diagonal of a square matrix
Multiply a column by a row
Angle between Two Vectors
Order of things - 2
Wayfinding 4 - Crossing, level 2
Remove element(s) from cell array
Order of things - 1
Only once: cleaning up your columns
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