.. _auto_curve_offset_to_change:

*OFFSET THE CURVE ALONG X WHEN THE INITIAL VALUE CHANGES BASED ON THE RATIO PROVIDED*
=====================================================================================

Detects the first significant change point in a curve's values (using a derivative-based threshold) and shifts all subsequent X-values by the detected offset amount. Use this worker to align time-history or signal curves whose meaningful data starts after an initial transient or delay.

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

Classification: **process**.

Tagged: ``change_detection``, ``curve``, ``derivative``, ``offset``, ``signal_alignment``, ``time_history``, ``x-shift``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve To Be Offset
     - curvetobeoffset
     - vector
     - —
     - 
     - Input XY curve (vector) whose X-axis will be shifted once a significant value change is detected; accepts any d3VIEW curve object.
   * - Ratio
     - ratio
     - float
     - 0.025
     - 
     - Change-detection threshold expressed as a fraction of the curve's maximum value (dimensionless float, default 0.025); lower values detect smaller changes, higher values require larger changes before triggering the offset.
   * - Order Of Derivative
     - order
     - float
     - 1
     - 
     - Order of the derivative used to detect the change point (integer float, default 1 for first-order derivative); increase to detect higher-order inflections.
   * - Offset Scale Factor
     - scale_factor
     - float
     - 1
     - 
     - Scalar multiplier applied to the X-offset amount (dimensionless float, default 1.0 shifts points to the right; use a negative value to shift to the left).

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_offset_to_change_output_1
     - curve_offset_to_change_output_1
     - vector
     - Resulting XY curve with X-values after the detected change point shifted by the computed offset, preserving the original curve shape and Y-values.

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

- data.curve.transform
- data.signal_processing

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

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

.. 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_offset_to_change</code>. Schema hash: <code>35a5781706a9</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>