.. _auto_curves_firstcurve:

*GET THE FIRST CURVE FROM THE COLLECTION OF CURVES*
===================================================

Extracts the first curve from a multi-curve collection. Use this worker when a downstream step requires a single curve and you want to select the leading entry from an ordered curve group.

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

Classification: **process**.

Tagged: ``collection``, ``curve_group``, ``curves``, ``first_curve``, ``selection``, ``transform``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve Group
     - curvegroup
     - vector
     - —
     - 
     - Ordered collection of curves (vector/multi-curve group) from which the first curve will be extracted; must contain at least one curve — leave unconnected only if the curve group is empty and no output is needed.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_firstcurve_output_1
     - curves_firstcurve_output_1
     - vector
     - The first curve extracted from the input curve group, returned as a single vector curve ready for downstream processing.

Disciplines
-----------

- data.curve.pair

Runnable example
----------------

A runnable example is registered for this worker. Open the example workflow on the d3VIEW canvas: `/api/workflow/example?id=curves_firstcurve <https://www.d3view.com/api/workflow/example?id=curves_firstcurve>`_

.. 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_firstcurve</code>. Schema hash: <code>e074a2b414b5</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>