In the test cases you wrote "your_fcn_name(x)" and not "your_fcn_name(l,b,h)" ;-)
Replace NaNs with the number that appears to its left in the row.
Find the sum of the elements in the "second" diagonal
Remove the two elements next to NaN value
Output any real number that is neither positive nor negative
Celsius to Kelvin
Convert a number to its Roman representation
Concatenate two strings
Reverse a matrix
Find the dimensions of a matrix
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