.. _auto_curves_lookup_keyvalue:

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

Iterates over a collection of curves and returns a key-value map where each key is a curve attribute (name, id, or file) and the value is a scalar extracted from that curve (e.g. xmax, ymin, first intersection). Use this worker to summarise a curve group into a flat lookup table for downstream processing.

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

Classification: **process**.

Tagged: ``batch``, ``curve_group``, ``curves``, ``keyvalue``, ``lookup``, ``scalar_extraction``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve Group
     - curve_group
     - vector
     - —
     - 
     - One or more input curves (Curve Group) to be iterated over; each curve contributes one key-value pair to the output. Leave empty only if curves are supplied programmatically by an upstream worker.
   * - Type
     - type
     - scalar
     - xfirst
     - 
     - The scalar quantity to extract from each curve — e.g. 'xmax' for the maximum X value, 'ymin' for the minimum Y, 'first_intersect_x' for the first zero-crossing X coordinate, etc. Defaults to 'xfirst'.
   * - With Attr
     - with_attr
     - string
     - name
     - 
     - The 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_keyvalue_output_1
     - curves_lookup_keyvalue_output_1
     - keyvalue
     - A key-value map (dict/object) where each key is the selected curve attribute ('name', 'id', or 'file') and each value is the scalar extracted from the corresponding curve according to the chosen lookup type.

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

.. raw:: html

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   <p style="font-size:11px;color:#888">
   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_lookup_keyvalue</code>. Schema hash: <code>b28ab15d483e</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>