Loop End

Node at the end of a loop. It is used to mark the end of a workflow loop and collects the intermediate results by row-wise concatenation of the incoming tables. The start of the loop is defined by the loop start node, in which you can define how often the loop should be executed (either fixed or derived from data, e.g. the "group loop start"). All nodes in between are executed that many times.

Options

Row ID policy

It specifies how to deal with the row IDs.

• Generate new row IDs - row IDs are newly generated (Row0, Row1, ...)
• Unique row IDs by appending a suffix - the iteration number is added to each row ID from the incoming table, thus making the row IDs unique over all iterations
• Leave row IDs unmodified - the incoming row IDs are not altered. In this case you have to make sure that there are not duplicate row IDs in different iterations. Otherwise an error occurs.

Add iteration column

Allows you to add a column containing the iteration number to the output table.

Propagate modified loop variables

If checked, variables whose values are modified within the loop are exported by this node. These variables must be declared outside the loop, i.e. injected into the loop from a side-branch or be available upstream of the corresponding loop start node. For the latter, any modification of a variable is passed back to the start node in subsequent iterations (e.g. moving sum calculation). Note that variables defined by the loop start node itself are excluded as these usually represent loop controls (e.g. "currentIteration").

Ignore empty input tables

If this option is checked empty input tables and there structure are ignored and will not cause the node to fail.

Allow variable column types

If checked, the loop does not fail when the column types between different table iterations change.

Allow changing table specifications

If checked, the table specifications between iterations can differ. If column have been added or removed between iterations, missing values are inserted accordingly in the result table. If not checked and the table specifications differ, the node will fail.

Views

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Workflows

• _01_ChemicalLibraryEnumerationKNIME Hub
• _01_Network_Traffic_ReportingKNIME Hub
• _01_PMR_AnalysisKNIME Hub
• _Fetch_Experiment_Details_from_PubChemKNIME Hub
• _Fetch_Experiment_Details_from_PubChemKNIME Hub
• Show all 1854 workflows

Links

• KNIME E-Learning Course: Section 7.2. Re-executing Workflow Parts: Loops

  www.knime.com/knime-introductory-course/chapter7/section2
• Duplicate rows with a specific multiplierby qqilihq on 2020-02-17

  forum.knime.com/p/81739
• How to handle a loop end of column list loopby armingrudd on 2019-05-22

  forum.knime.com/p/60986
• Add Line Columnby armingrudd on 2019-04-15

  forum.knime.com/p/58746
• String replace (Dictionary) problemby danielesser on 2020-06-06

  forum.knime.com/p/93591
• Show all 11 links

Developers