This is a problem where there's probably a good built-in function, but I don't know it.
this will be hard to beat !
Whether the input is vector?
Getting the row and column location from a matrix
Remove the two elements next to NaN value
create a circulant matrix
Length of the hypotenuse
Create a patchwork matrix
middleAsColumn: Return all but first and last element as a column vector
Reference Index Number
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