.. _auto_curves_retain_first_last_points:

*RETAIN ONLY THE FIRST AND LAST POINTS OF A CURVE*
==================================================

Strips all intermediate points from one or more curves, retaining only the first and last data points of each. Use this worker to reduce a curve to its endpoints, for example to extract boundary values or simplify a curve before further processing.

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

Classification: **process**.

Tagged: ``curve``, ``endpoints``, ``first``, ``last``, ``reduce``, ``retain``, ``simplify``.

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 whose intermediate points will be discarded; only the first and last point of each curve are kept. Accepts any curve format supported by the platform (e.g. time-history or XY pairs).

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_retain_first_last_points_output_1
     - curves_retain_first_last_points_output_1
     - vector
     - The reduced curve(s), each containing exactly two points — the original first and last data points of the corresponding 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_retain_first_last_points <https://www.d3view.com/api/workflow/example?id=curves_retain_first_last_points>`_

.. 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_retain_first_last_points</code>. Schema hash: <code>9e2ab3f41356</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>