.. _auto_curve_offset_to_first_point:

*COMPUTE CURVE RELATIVE TO THE FIRST POINT*
===========================================

Offsets a curve so that its first data point becomes the new origin (zero reference). Use this worker when you need to normalize a curve relative to its starting value before further analysis or comparison.

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

Classification: **process**.

Tagged: ``curve``, ``first_point``, ``normalization``, ``offset``, ``relative``, ``transform``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve
     - curve
     - vector
     - —
     - 
     - Input curve (X/Y vector pair) to be offset; the Y-values will be shifted so that the first point becomes zero. Accepts any general-purpose curve — leave unconnected only if the worker is used in a pass-through chain.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_relative_to_first_point_output_1
     - curve_relative_to_first_point_output_1
     - vector
     - Transformed curve whose Y-values are offset by the negative of the first Y-value, making the first point the zero reference; X-values are unchanged.

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

.. 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_offset_to_first_point</code>. Schema hash: <code>11302ff3a2f0</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>