计算列中有序单元格之间的差异Spotfire

Question

What would be the calculated column formula for trying to calculate the thickness (difference between cells of different depths) for each PLACENAME. See table below. The thickness I am trying to calculate is the difference between each depth increment.

Answer 1

Since your data is already sorted, there is no need to place row numbers based on the ranking (order) of the Depth . If the rows were unsorted, we would need to use Rank() to apply a sort order based on the Depth and PLACENAME . Depending on what row and what direction you want to do the difference to be calculated, you can use the following formulas:

[Thickness] - First([Thickness]) over (Intersect([PLACENAME],Next([Depth]))) AS [DifferenceBelow]

[Thickness] - First([Thickness]) over (Intersect([PLACENAME],Previous([Depth]))) AS [DifferenceAbove]

You will get the following results:

Answer 2

@FLgeo- As per your question, the below custom expression should calculate the difference of depths for each Placename.

Abs([Depth] - Sum([Depth]) OVER (Intersect(Next([RowID]),[PlaceName])))

Note: 'RowID' column is added for computation purpose. This need not be displayed in the table.

Question - Your table shows thickness value for the last rows of Placenames A & B, how did you calculate those?