Substracting values between many columns - Loop?

Hi,

first I w

Test for knime hub.xlsx

ant to wish a happy new year.

I have an excel sheet with data of different dates. The data should be substracted between different columns. This could be a problem of a nested loop.

The main procedure is to substract values between columns so that you get in the result table the result of the difference. The practice is in the first step to substract between column 2 and 1, then between column 3 and 1 and then between column 4 and 1. Then you move one column further so that you move in the second step to substract between column 3 and 2 and column 4 and 2. And in the third step to substract between column 4 and 3. Could be a node like column expression and probably with nested loops, but i couldn’t find the right code for nested loop in this node.

Hint this will later be a table with more than 100 rows and columns. There are also missing values like in the last row.

An example is shown below in the uploaded excel file.

Thanks for responding.