.. _auto_curve_get_value_by_index:

*GET THE VALUE BY INDEX*
========================

Retrieves a single scalar value (X or Y) from a curve at a specified integer index position. Use this worker when you need to extract a point value from a curve by its positional index rather than by an X-axis lookup.

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

Classification: **process**.

Tagged: ``curve``, ``extract``, ``get_value``, ``index``, ``lookup``, ``scalar``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve To Be Looked Up
     - curvetobelookedup
     - vector
     - —
     - 
     - The input curve (X/Y vector) from which a value will be retrieved by index.
   * - Index Number
     - index_number
     - scalar
     - 0.0
     - 
     - Zero-based integer index of the point to retrieve from the curve; defaults to 0 (the first point).
   * - Return Type
     - return_type
     - scalar
     - y
     - 
     - Axis component to return at the specified index: 'x' for the X-coordinate or 'y' for the Y-coordinate; defaults to 'y'.
   * - Not Found Value
     - not_found_value
     - scalar
     - 0.0
     - 
     - Fallback scalar value returned when the specified index does not exist in the curve; defaults to 0.0.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_get_value_by_index_output_1
     - curve_get_value_by_index_output_1
     - scalar
     - Scalar X or Y value extracted from the curve at the specified index, or the not_found_value if the index is out of range.

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

.. 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_get_value_by_index</code>. Schema hash: <code>dba61d9d76f9</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>