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
pressure to dB?
Replace multiples of 5 with NaN
Equal to their cube
Back to basics - mean of corner elements of a matrix
List all of the integer points in a bounded feasble region
Recaman Sequence - I
Write out numbers in words
Integer to boolean
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