Two Port Loop End (Column Appender)

KNIME Analytics Platform
#1

Dear Community,

I'm currently setting up a machine learning workflow. Part of the flow is that I calculate normalized values for some  features i calculate within a loop (the features are generated by means of an external description from a matrix). I'm doing the normalization by using the normalizer (PMML) node, such that I can reuse the normalization factors from the training set for the test set. I planned to do this within a loop and to append the normalized columns to the original matrix.However I'd need for this a two port version of the Column Appender Loop end. So this one is sadly not available in Knime. Hence, I was wonderin wether someone implmented such a node or has a decent workaround?

... or do I have to code such a node myself? If so where can I find the source for the column appender Loop end node

Ingo
 

#2

Hi Ingo,

maybe you could use the "regular" Loop End with two ports together with several Transpose nodes? You might run into problems with the types, though.