.. _auto_curves_add_zero_origin:

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

Ensures each input curve contains a (0, 0) origin point by prepending it if one does not already exist. Use this worker to normalise curves before fitting or comparison when a zero-origin anchor is required.

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

Classification: **process**.

Tagged: ``curves``, ``normalise``, ``preprocessing``, ``transform``, ``zero_origin``.

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 vector pairs) to be checked and updated; if any curve is missing a (0, 0) point it will be prepended automatically. Optional — leave empty to pass through without modification.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_add_zero_origin_output_1
     - curves_add_zero_origin_output_1
     - vector
     - The same set of curves returned in order, each guaranteed to start with a (0, 0) data point; format and units are preserved from the input.

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_add_zero_origin <https://www.d3view.com/api/workflow/example?id=curves_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>curves_add_zero_origin</code>. Schema hash: <code>0d34525a1656</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>