hello all, i have a set of data points similar to the table below
Distance Elevation
0 km 350 m
17 km 355 m
21 km 366 m
30 km 375 m
45 km 370 m
55 km 340 m
60 km 355 m
the table that i have has a total of 48000 rows and i have to select 1000 among them. Can any body let me know a way to do that. i want to select the rows whose elevation is beyond the range of +/- 5 m from the elevation of the previous row. as an example i need to get the following table from the table from above
Distance Elevation
0 km 350 m
21 km 366 m
30 km 375 m
55 km 340 m
60 km 355 m
a quick respose is greatly appreciated
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