.. _auto_curves_multiply:

*MULTIPLY TWO CURVES*
=====================

Multiplies two curve groups element-wise, interpolating onto a common x-axis before computing the product. Use this worker whenever you need the point-by-point product of two time-history or XY curves, with control over interpolation domain and extrapolation behaviour.

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

Classification: **process**.

Tagged: ``curve_math``, ``curve_product``, ``element_wise``, ``extrapolation``, ``interpolation``, ``multiply``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve Group 1
     - curve_group1
     - vector
     - —
     - 
     - First curve group (one or more XY curves) to be multiplied; accepts any vector/curve collection — this is the left-hand operand.
   * - Curve Group 2
     - curve_group2
     - vector
     - —
     - 
     - Second curve group (one or more XY curves) to be multiplied; must be pair-matched with Curve Group 1 — this is the right-hand operand.
   * - Points
     - points
     - scalar
     - unique
     - 
     - X-axis sampling strategy for the result: 'unique' merges all x-points from both curves (default), 'first_curve' reuses only the x-points of the first curve.
   * - Extrapolation Type
     - extrapolate
     - scalar
     - no
     - 
     - Controls behaviour outside the overlapping x-range: 'no' assigns 0.0 beyond the bounds (default), 'yes' linearly extrapolates, 'constant' holds the last in-range value.
   * - Start X
     - start_x
     - text
     - —
     - 
     - Optional lower bound on the x-axis domain to which the multiplication is applied; leave blank to use the full range (defaults to −1×10²⁰).
   * - End X
     - end_x
     - text
     - —
     - 
     - Optional upper bound on the x-axis domain to which the multiplication is applied; leave blank to use the full range (defaults to +1×10²⁰).

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_multiply_output_1
     - curves_multiply_output_1
     - vector
     - Resulting curve group containing the element-wise product of the two input curve groups, sampled on the resolved x-axis grid within the specified domain.

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

.. 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_multiply</code>. Schema hash: <code>efebf023c661</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>