.. _auto_curve_add_zero_origin:

*ADD A VALUE 0,0 IF IT DOES NOT EXISTS*
=======================================

Ensures a curve begins at the origin by prepending a (0, 0) point if one does not already exist. Use this worker to normalize curves before further processing or model fitting that requires a zero-origin boundary condition.

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

Classification: **process**.

Tagged: ``curve``, ``normalization``, ``prepend``, ``transform``, ``zero_origin``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Choose The Curve
     - curve_input
     - vector
     - —
     - 
     - Input curve (X/Y vector) to be checked and modified; if the curve does not already contain a (0, 0) point, one will be prepended — leave as default (null) only if the curve is supplied programmatically upstream.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_add_zero_origin_output_1
     - curve_add_zero_origin_output_1
     - vector
     - Output curve identical to the input but guaranteed to start at (0, 0); same units and format as the input vector.

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=curve_add_zero_origin <https://www.d3view.com/api/workflow/example?id=curve_add_zero_origin>`_

.. raw:: html

   <hr style="margin-top:2em">
   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_add_zero_origin</code>. Schema hash: <code>06730247a681</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>