If the input is a negative number, generate an error. Otherwise, return the number.
Replace NaNs with the number that appears to its left in the row.
Getting logical indexes
Return the first and last character of a string
Magic is simple (for beginners)
Determine the number of odd integers in a vector
Determine which fields have been modified in a structure
Maximum of each diagonal
Create a figure and plot data
Cumulative minimum of an array
Convert RGB triplet to ColorSpec string
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