.. _auto_curves_lookup_yvalueat:

*LOOKUP Y-VALUE FROM A GIVEN X-VALUE*
=====================================

Performs a point lookup on one or more curves, returning the interpolated y-value at a specified x-value. Use this worker whenever you need to extract a single response value (e.g. force, displacement, acceleration) at a known abscissa from a curve dataset.

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

Classification: **process**.

Tagged: ``curve``, ``interpolation``, ``lookup``, ``point-query``, ``x-value``, ``y-value``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves To Be Looked Up
     - curvestobelookedup
     - vector
     - —
     - ✓
     - One or more input curves (x–y pairs) from which the y-value will be interpolated; accepts a vector of curve objects — provide at least one curve, multiple curves are processed independently.
   * - X Value
     - x_value
     - float
     - 0.0
     - ✓
     - The x-axis position (float, same units as the curve's x-axis) at which the corresponding y-value is to be looked up; defaults to 0.0.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_lookup_yvalueat_output_1
     - curves_lookup_yvalueat_output_1
     - dataset
     - A dataset containing one row per input curve with the curve identifier and the interpolated y-value found at the specified x-value.

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

- data.curve.pair
- 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_lookup_yvalueat <https://www.d3view.com/api/workflow/example?id=curves_lookup_yvalueat>`_

.. raw:: html

   <hr style="margin-top:2em">
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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_lookup_yvalueat</code>. Schema hash: <code>296a30d4b78a</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>