If the input is a negative number, generate an error. Otherwise, return the number.
Return the 3n+1 sequence for n
Convert a vector into a number
Matrix which contains the values of an other matrix A at the given locations.
Find the position of first minimum value in an integer array with numbers
Vectors counting by 2
Change a specific color in an image
Find similar/related functions
Find mistyped words in text (mixed-up letters)
Check if vertices form a rectangle
Create a figure and plot data
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