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
How to find the position of an element in a vector without using the find function
Getting logical indexes
Rotate input square matrix 90 degrees CCW without rot90
Generate a string like abbcccddddeeeee
Back to basics - mean of corner elements of a matrix
Bridge and Torch Problem - Length of Unique Time List
Happy Free Wednesday!
Peg Solitaire - Apply Move
Grouped Frequency Distributions
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