Hi,

I would like to compare row data in the same column through a data frame
and remove all rows that do not fit the criteria.
for example if I have the following data frame:
  line start  A1 21  A2 22  A3 23  B4 19  B2 24  B6 12
I would like to compare the 'start' value of each line to the value of next
line (22-21,23-22,19-23,24-19,12-24) and if it is smaller then to remove
the line so that at the end I would get
  line start  A1 21  A2 22  A3 23  B2 24

Thanks,

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