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 !
Replace NaNs with the number that appears to its left in the row.
does it touch ?
Back to basics 17 - white space
Generate N equally spaced intervals between -L and L
middleAsColumn: Return all but first and last element as a column vector
Matrix indexing with two vectors of indices
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