.. _auto_curve_retain_first_last_points:

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

Reduces a curve to just its first and last data points, discarding all intermediate points. Use this when only the endpoints of a curve are needed for downstream processing or reporting.

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

Classification: **process**.

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

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) whose first and last points will be retained; all intermediate points are discarded.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_retain_first_last_points_output_1
     - curve_retain_first_last_points_output_1
     - vector
     - Output curve containing exactly two points: the first and last points of the input curve, preserving their original X/Y values.

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_retain_first_last_points <https://www.d3view.com/api/workflow/example?id=curve_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>curve_retain_first_last_points</code>. Schema hash: <code>12e14c6b35a0</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>