This solution only works for vectors that are already sorted from low to high :) but it passed the test suite
Which doors are open?
Replace NaNs with the number that appears to its left in the row.
radius of a spherical planet
Matlab Basics - Convert a row vector to a column vector
Create a matrix X, where each column is a shifted copy of the vector v
vectorization in N
Remove from a 2-D matrix all the rows that contain at least one element less than or equal to 4
Matrix with different incremental runs
Remove NaN ?
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