Dynamic row calculation of columns

[gonhaddock]

Hello @aj05 and welcome to the KNIME forum.
This is your workflow:

1. Send your column $F$ to variable $${DF}$$
   It takes the first row by default

2. Rule Engine column $factor$:

NOT $F$ = $${DF}$$ => $F$
TRUE => 1

3. Moving Aggregation $Product$
   You can control the window length as variable from a ‘Table Dimension’ node (not included)
   

   

4. Math Formula:

$${DF}$$ * $Product(factor)$

BR