.. _auto_curves_getbyindex:

*GET CURVE BY INDEX. USEFUL FOR EXTRACTING A CURVE FOR A COLLECTION OF CURVES USING THE ORDER.*
===============================================================================================

Extracts a single curve from a collection of curves by its zero-based position index. If the index is not found, an optional default index is used as a fallback. Use this worker when you need to isolate one curve from an ordered curve group within a workflow.

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

Classification: **process**.

Tagged: ``curve_extraction``, ``curve_group``, ``curves``, ``getbyindex``, ``index``, ``transformations``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves
     - curves
     - vector
     - —
     - 
     - Ordered collection of input curves (CurveGroup) from which a single curve will be selected; accepts multiple curves.
   * - Index
     - index
     - integer
     - 0
     - 
     - Zero-based integer index of the curve to extract from the collection; defaults to 0 (first curve). Also accepts a curve name string as a fallback lookup.
   * - Default Index if not found
     - default_index
     - scalar
     - —
     - 
     - Fallback index to use when the primary index is not found in the collection; leave blank to return null on a miss.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_getbyindex_output_1
     - curves_getbyindex_output_1
     - vector
     - The single curve extracted from the input collection at the specified (or fallback) index.

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

.. 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_getbyindex</code>. Schema hash: <code>06cc5b7586aa</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>