.. _auto_curves_lookup_dataset:

* THIS FUNCTION LOOKS INTO A COLLECTION OF CURVES AND RETURNS  CURVENAME=>LOOKUP VALUE*
=======================================================================================

Iterates over a collection of curves and builds a key-value map of curveName (or curve id/file) to a requested lookup value (e.g. Y-minimum or Y-maximum). Use this worker to quickly extract a named scalar statistic from every curve in a group in a single step.

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

Classification: **process**.

Tagged: ``batch``, ``curve_group``, ``curves``, ``dataset``, ``key_value``, ``lookup``, ``ymax``, ``ymin``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve Group
     - curve_group
     - vector
     - —
     - 
     - Collection of input curves to query; accepts multiple curve objects. Leave empty only if curves are injected upstream — at least one curve must be present for a meaningful result.
   * - Type
     - type
     - scalar
     - ymin
     - 
     - Scalar statistic to extract from each curve: 'ymin' returns the minimum Y value and 'ymax' returns the maximum Y value. Defaults to 'ymin'.
   * - With Attr
     - with_attr
     - string
     - name
     - 
     - Curve attribute used as the key in the output map: 'name' (human-readable label), 'id' (internal identifier), or 'file' (source filename). Defaults to 'name'.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_lookup_dataset_output_1
     - curves_lookup_dataset_output_1
     - keyvalue
     - Key-value dataset where each key is the selected curve attribute (name, id, or file) and each value is the extracted scalar statistic (ymin or ymax) for that curve.

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

- data.curve.pair
- data.statistics

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

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

.. 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_lookup_dataset</code>. Schema hash: <code>1a3973c1545b</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>