.. _auto_curve_difference_between:

*COMPUTE THE DIFFERENCE BETWEEN TWO YFIRST AND YAST VALUES*
===========================================================

Computes the difference between the Y value at the first X point and the Y value at the last X point within a specified X range on a curve. Use this worker to quickly extract the net Y change (ΔY) across a bounded interval of any time-history or XY curve.

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

Classification: **process**.

Tagged: ``curve``, ``delta``, ``difference``, ``range``, ``scalar``, ``transform``, ``y_first``, ``y_last``.

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 XY curve (vector) on which the Y difference will be computed; must contain at least two data points within the specified X range.
   * - X Min
     - x_min
     - float
     - 0.0
     - 
     - Lower bound of the X range (float, same units as the curve's X axis); data points with X values below this threshold are excluded — defaults to 0.0, which processes from the curve's start.
   * - X Max
     - x_max
     - float
     - 0.0
     - 
     - Upper bound of the X range (float, same units as the curve's X axis); data points with X values above this threshold are excluded — defaults to 0.0, which should be set to the desired end of the interval.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_difference_between_output_1
     - curve_difference_between_output_1
     - scalar
     - Scalar ΔY value representing the difference between the Y value at the last X point and the Y value at the first X point within the specified [x_min, x_max] window, in the same units as the curve's Y axis.

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

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curve_difference_between</code>. Schema hash: <code>99688d94fb89</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>