Compare current and previous row in Java Knime

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It’s possible, though rather crude. I suggest to have a look here:

Java Node Loop over Rows

I have a class of tricky data management problems where the current value of a cell does depend on the value of previous cells in the same column as well as on previous values of other columns. I could do this with first using a “Lag Column” node and thereafter a combination of “Rule Engine”/“Math Formula” or I could pipe the whole thing to R do the transformation there and than pipe it back to Knime. While the Knime solution might work it is not very flexible. The R solution on the other hand…