Additional test cases have been added.
Replace NaNs with the number that appears to its left in the row.
Set the array elements whose value is 13 to 0
Output any real number that is neither positive nor negative
Upper triangular matrix
Vector Magnitude Calculator
Create an 8-color version of an image
Return elapsed time
Find mistyped words in text (mixed-up letters)
Minimum of each diagonal
Find similar/related functions
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