.. _auto_curve_add_difference:

*COMPUTE THE Y-DIFFERENCE COMPARED TO THE PREVIOUS POINT*
=========================================================

Computes the point-to-point y-difference for each sample in a curve, replacing each y-value with the difference relative to its immediately preceding point. Use this worker to convert a cumulative or absolute y-signal into a delta (incremental change) series.

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

Classification: **process**.

Tagged: ``curve``, ``delta``, ``difference``, ``incremental``, ``transform``, ``y-diff``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve In
     - curve_in
     - vector
     - —
     - 
     - Input curve (x/y vector) whose y-values will be differenced; each output y-value becomes y[i] − y[i−1]. Leave the x-range defaults (xmin/xmax) to process the full curve.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_add_output_1
     - curve_add_output_1
     - vector
     - Output curve with the same x-values as the input but y-values replaced by the successive y-differences (delta series); the first point is typically zero or the original first value depending on convention.

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

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_add_difference</code>. Schema hash: <code>a49f3ce8a915</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>