Math Formula Node - IF-Condition

[jeraldrowell]

I’m pretty new to Knime, and I can’t get it to work. I would like to subtract B from A, but if B is null, then it would retain A. I hope you can help me. Thanks a lot.

[elsamuel]

Welcome to the forum @jeraldrowell.

For something like this, I’d use the Column Expressions node, with an expression like:

if (not(isMissing(column("B"))))
{column("A")-column("B")}
else {column("A")}