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
Set some matrix elements to zero
We love vectorized solutions. Problem 1 : remove the row average.
Colon operator of two vectors
sum of non-primes
Fix the last element of a cell array
Bridge and Torch Problem - Length of Unique Time List
String permutations on phone keyboard
Homemade: Control Charts
Recaman Sequence - III
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