Good morning, I am not practical with colum expression. I am creating a column named “Number_2”. I want this column to be 1 or the value in cell above of the same column ("Number_2,-1) plus 1. I receive an error of missing column (the one that I am creating). I would expect the column to be recognize as it should be iterative. Is there any way to refer to row n-1 of the same column that I am creating? [image]

Hey there, right now it is not possible to refer to the column you are creating in the expression you are creating the column with. If I remember correctly in the release event it was mentioned it is on the roadmap to enable this in the new Expressions node in the future. [What’s New in KNIME Analytics Platform 5.3] A work around could be to add the column generically and then send it into a recursive loop that processes one row at a time…

Unknow colum in Column Expression

KNIME Analytics Platform

ArjenEX July 25, 2024, 12:51pm 4

Note that the honorable @takbb found that CE does have some memory capability as well but might not be worth the effort to get it properly running if there’s an easier alternative.

2 Likes