.. _auto_curve_scale_after_first_peak:

*SCALE AFTER FIRST PEAK*
========================

Detects the first peak in a curve and applies independent X and Y scale factors to all data points after that peak, leaving the pre-peak portion unchanged. Use this worker to rescale the post-peak (softening/unloading) region of a curve—for example, a stress-strain or force-displacement response—without distorting the initial rise. An optional monotonicity enforcement can prevent the scaled tail from reversing direction.

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

Classification: **process**.

Tagged: ``curve``, ``force-displacement``, ``monotonicity``, ``peak``, ``post-peak``, ``scale``, ``stress-strain``, ``transform``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve To Be Scaled
     - curvetobescaled
     - vector
     - —
     - 
     - Input XY curve (e.g., force-displacement or stress-strain) whose data points after the first peak will be scaled; leave unconnected only if the curve is supplied upstream via context.
   * - Scale X Value
     - scale_x
     - scalar
     - 0.5
     - 
     - Multiplicative scale factor applied to the X-axis values after the first peak; default is 0.5 (halves the post-peak X span).
   * - Scale Y Value
     - scale_y
     - scalar
     - 2
     - 
     - Multiplicative scale factor applied to the Y-axis values after the first peak; default is 2 (doubles the post-peak Y values).
   * - Enforce Monotonicity
     - enforce_monotonicity
     - scalar
     - no
     - 
     - When set to 'yes', forces the scaled post-peak segment to remain monotonically non-increasing so the output curve never reverses direction; default is 'no'.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_scale_after_first_peak_output_1
     - curve_scale_after_first_peak_output_1
     - vector
     - Transformed XY curve with the original pre-peak segment intact and independent X/Y scaling applied to all points beyond the first peak.

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

.. 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_scale_after_first_peak</code>. Schema hash: <code>e18fb3094495</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>