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.

You can add more input and ouput tables using the “…” menu.

Options

RowID policy

Specifies how to deal with the RowIDs for each table.

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

Add iteration column

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

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 their structures 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. The resulting column will have the common super type of the different column types.

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.

Input Ports

: Any data table
…: Any data table

Output Ports

: Collected results from the loop body
…: Collected results from the loop body

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Installation

To use this node in KNIME, install the extension KNIME Base nodes from the below update site following our NodePit Product and Node Installation Guide:

v5.2

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland

Plugin version: 5.2.2.v202403061155

On NodePit since: 2023-12-06

Last update: 2024-04-19

KNIME versions: Since v4.5

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