Replace NaNs with the number that appears to its left in the row.
Is it a number?
String Array Basics, Part 1: Convert Cell Array to String Array; No Missing Values
Count the number of folds needed to pack a large sheet
Find an optimal placement of coolers on a grid
Create a matrix map of increasing safety levels
Propagate the effects of a blockage in a chemical plant
Trace the path of a harmful chemical in an ecological network
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