.. _auto_curves_extrapolate_constant:

*EXTRAPOLATE THE CURVES WITH A CONSTANT VALUE*
==============================================

Extends one or more curves beyond their last data point by appending a constant value, effectively holding the final Y value (or a user-specified constant) out to a specified X endpoint. Use this worker when downstream analysis requires curves to share a common X range or when a flat extrapolation assumption is appropriate.

When to use
-----------

Classification: **process**.

Tagged: ``constant``, ``curve``, ``extend``, ``extrapolate``, ``flat``, ``hold_last``, ``transformations``.

Inputs
------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves
     - curves
     - vector
     - —
     - 
     - One or more input curves (X-Y pairs) to be extrapolated; accepts multiple curve objects in d3VIEW curve format.
   * - Last X-Value
     - x_last
     - scalar
     - 1
     - 
     - The X-axis value up to which each curve will be extrapolated; defaults to 1 — set this to the desired end of the extended X range (same units as the curve's X axis).
   * - Last Y-Value
     - y_last
     - scalar
     - 1
     - 
     - The constant Y value used for the extrapolated segment; defaults to 1 — override with the flat level to hold beyond the curve's last original data point (same units as the curve's Y axis).

Outputs
-------

.. list-table::
   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - curves_extrapolate_constant_output_1
     - curves_extrapolate_constant_output_1
     - vector
     - The input curves with each one extended to x_last using the constant y_last value, returned as a vector of X-Y curve objects in the same format as the inputs.

Disciplines
-----------

- data.curve.transform

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curves_extrapolate_constant <https://www.d3view.com/api/workflow/example?id=curves_extrapolate_constant>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_extrapolate_constant</code>. Schema hash: <code>6f6e13a22d1c</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>