.. _auto_curves_offset_to_first_point:

*REMOVE OFFSETS BASED ON THE FIRST POINT*
=========================================

Removes the offset from one or more curves by subtracting the first point's X and Y values, making all curves relative to their own starting point. Use this to align curves that share a common baseline or to eliminate sensor/measurement offsets before further analysis.

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

Classification: **process**.

Tagged: ``baseline_correction``, ``curve_normalization``, ``first_point``, ``offset_removal``, ``transformation``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves
     - curve
     - vector
     - —
     - 
     - One or more input curves (X/Y vector pairs) whose offsets will be removed; each curve is shifted so its first point becomes the origin (0, 0). Optional — leave empty to produce no output.

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
     - Offset-corrected curve(s) where each input curve has been translated so that its first data point is at the origin; one output curve is produced per input curve.

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_offset_to_first_point <https://www.d3view.com/api/workflow/example?id=curves_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>curves_offset_to_first_point</code>. Schema hash: <code>58211ceef505</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>