Lag Column Flow Variable

[MrSampson]

It sure would be handy if the Lag Column node output the lagged column name as a flow variable!

[armingrudd]

Hi @MrSampson and welcome back to the KNIME forum,

It is already possible to do that in the “Flow Variables” tab of the node’s configuration window:

[MrSampson]

Thanks @armingrudd. I’m sorry I was unclear. I mean the output column, like the one with the column name as “lag-column(-1)”.

[armingrudd]

It is easy to create it having the original column name. If the original column name is provided by the variable “lag-column” you can use the String Manipulation (Variable) node to create the column name:
join($${Slag-column}$$, "(-1)")

[MrSampson]

Right. And I can use the flow variable for the lag to fill out the column name, so I wouldn’t have to change it manually every time I change the lag. That’s why I suggested it would be “handy” by saving me the couple of mintues of doing that.

It’s no big deal, I just thought I would throw it out there. (Including an input field to change the output column name, would also be nice.)

[ipazin]

Hello @MrSampson,

if you are after to rename lagged column maybe this topic helps:

Rename in Lag-Node or Rename by Position

I am using the Lag Column Node to get lag values. The problem is that I have to rename the column to fit to the naming conventions AND I do not know which column gets lagged since this is controlled by a Column Selection Configuration node. If there would be a rename config within the Lag Column I could use this (=> Feature Request) If there was any way to rename a column by position, I could do the renaming directly after producing the lag since the lag column is always appended to the righ…

Br,
Ivan