grouping rows -> PCA calculations

KNIME Analytics Platform
1

Hi,

Have got a column with cluster identification. Using this column for grouping, would like to perform the PCA on separate sets (i.e. different clusters)

How to do it in KNIME (using looping?)

2

Use the "Group Loop Start" and pick the column that has the cluster identifiers in it.

3

Thank you

I hope it will work, but I need some more detailed instructions

My attempt with the sequence:

Group Loop Start->PCA compute->Data to Report

yielded PCA for only the first cluster or, otherwise

"ERROR     Loop End   Execute failed: Input table's structure differs from reference (first iteration) table: different column counts 12 vs. 19"

dont really understand how to activate other loops?

May be, some relevant examples on the Group Loop start node exist for dummies?

 

4

Have you checked the "allow variable column types" in the loop end node?

Thanks,

Natasja

 

5

Thank you

It works