The description of this problem is not very clear. It's really asking for the first and last row for each unique value in the first column.
"However there will be more than one row index and that makes this question challenging." - that really explains nothing to me
radius of a spherical planet
Angle between two vectors
Replace May with April
Getting logical indexes
Find two triangular numbers whose sum is input.
Challenging perms function!
Your favourite city!
Calculate trends in time series
Mean = Standard Deviation
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