Ruby Snippet

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Executes a small jRuby script. The main difference between this node and Ruby Script is that it operates with each row of input DataTable separately and returns a new row for output DataTable. A simple example script is included in the dialog's text window of the Script tab.

This node uses Ruby-wrapper. See knime.rb at ruby4knime

Also, you can include additional gems from an external jRuby installation. But before that do setup jRuby path in preferences.

Options

Script output

Append columns to input table spec
If checked, the columns as given in the list are appended to the input table specification. The number of columns in the output table equals the number of input columns plus the number of columns as given in the list. If unchecked, the output table will have exactly the same number of columns as given in the list.
Column list
Specify the column name and type of all result columns. After adding a new column, click on the name or type to change its value.

Script

$out_data_0
Output container housing the outgoing DataTable for output port 0. This must be populated with rows by the script or else there will be no output from the node.
row
Current row of input DataTable.
Example use to copy all input rows of DataTable: 
    row # Only row!
Example use to extend input rows by new columns: 
    row << Cells.new.string('Hi!').int(row[0].to_s.length))
Example use to create new DataTable from custom columns 
    Cells.new.double(row[0].to_f).double(row[2].to_f - row[1].to_f)

Input Ports

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Table that the Ruby script will operate on.

Output Ports

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Table containing the results of the Ruby script.

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Installation

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

v5.9
Plugin provider:
Plugin version: 0.0.10
On NodePit since: 2025-12-13
Last update: 2026-01-13
KNIME versions: Since v3.6
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