TableRow to Variable Loop - loop-end problem

KNIME Analytics Platform
1

Hi!

I wanted to generate a KNIME workflow that reads in multiple sd files, calculates some similarity and writes out new sd files.

I started this with a "List Files" node, that gets all the files I need. Then I attached a "TableRow To Variable" node, which is connected to an "SDF Reader" node.

Afterwards, I compare the sd file with a SMILES code ("SMILES input" node) using the "Most Similar Molecule(s)" node (MOE node). The output is linked to an SDF Writer. Additionally I connected the "Most Similar Molecule(s)" node with the "Java Edit Variable (simple)" node to get a proper name for the output file --> this node is also connected to the "SDF Writer", via Flow Variable Ports.

Until this part everything works fine - so if I only would have one SD file I would have no problem. 

However, I attached the "Most Similar Molecule(s)" node to a "Loop End" node and also connected the "SDF Writer" via Flow Variable ports with the "Loop End".

Now, when I want to execute the workflow, I always get the error mesage: "Encountered loop-end without corresponding head!

I already tried different loop ends: "Loop End (Column Append)", "Variable Loop End" - but nothing works. 

Any suggestions?

Thank you, Freya

2

Not encountered that specific error but occasionaly putting the nodes that should run within the loop inside a meta node fixes some issues for me. Maybe worth a try?

 

Sam

3

collapsing the nodes within the loop into a meta node also did not solve the problem.

However, I encountered a warning message, when I start the loop, which is:

"WARN TableROW to Variable Table has 24 rows, ignored all rows except the first one"

Can this have something to do with my problem???

4

Table row to variable only ever takes the first row values.

if you want all values to be used, then use the table row to variable loop start node.

 

simon

5

Ah sorry, I didn't read carefully enough. As Simon said below you are using the wrong node if you want to do a loop over all the columns.

 

Cheers

 

Sam

6

wow thanks! it was that easy...

i did not really realize, that there were two nodes with such similar names...

thanks again!