Change given string to number. (hint: there is already function)
Changing from ['1234'] to  is one of example
Please expand the test suite so that solutions like this do not work.
Swap the first and last columns
Sum of series V
Determine the mean of matrix
Area of a Square
Calculate area of sector
Analyze observation data
Calculate some equation
Replace 0 to NaN!
Where is 1?
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