.. _auto_curve_before_after:

*COMPUTE THE BEFORE_AFTER OF THE CURVE*
=======================================

Splits a curve into its "before" and/or "after" segments relative to a reference point (e.g. time-zero or peak). Use this worker when you need to isolate the pre-event or post-event portion of a signal for downstream processing or comparison.

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

Classification: **process**.

Tagged: ``before_after``, ``curve_segment``, ``curve_split``, ``signal_segment``, ``time_history``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curve
     - curve
     - vector
     - —
     - 
     - Input curve (X-Y vector) to be split; typically a time-history or signal curve — leave empty only if the curve will be injected dynamically by an upstream worker.
   * - Return Type
     - return_type
     - scalar
     - both
     - 
     - Controls which segment(s) are returned: 'before' returns only the pre-split portion, 'after' returns only the post-split portion, and 'both' (default) returns the full before-and-after pair concatenated as a single output vector.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_before_after_output_1
     - curve_before_after_output_1
     - vector
     - Resulting curve segment(s) as a vector: the before portion, the after portion, or both concatenated, depending on the selected Return Type.

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

.. 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_before_after</code>. Schema hash: <code>fed5ea2cf1cc</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>