If the input is a negative number, generate an error. Otherwise, return the number.
Sorted highest to lowest?
peta to nano (x-ray)
matrix of natural number
Replace odd number in given matrix by zero
Check if a directory is on the current MATLAB search path
Find the nearest prime number
Create an 8-color version of an image
Find similar/related functions
Calculate a modified Levenshtein distance between two strings
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