.. _auto_curves_enforce_zeroorpositivelastslope:

*ENSURE THAT THE LAST SLOPE IS GREATER THAN ZERO*
=================================================

Ensures that the terminal slope of each input curve is zero or positive. Depending on the selected mode, it either appends a small positive-slope segment to curves that end with a negative slope ("add") or strips trailing negative-slope points from the curve tail ("remove"). Use this worker to condition material or force-displacement curves before solver input.

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

Classification: **process**.

Tagged: ``curve_conditioning``, ``curve_enforcement``, ``last_slope``, ``material_curve``, ``positive_slope``, ``trailing_slope``, ``zero_slope``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves To Be Enforced Up
     - curvestobeenforcedup
     - vector
     - —
     - 
     - Group of one or more input curves (vector) whose terminal slope must be made zero or positive; accepts any X-Y curve collection (e.g. stress-strain, force-displacement).
   * - Type
     - type
     - string
     - add
     - 
     - Enforcement strategy: 'add' (default) appends a synthetic positive-slope point to fix a negative tail; 'remove' deletes trailing data points until the last slope is non-negative.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_enforce_zeroorpositivelastslope_output_1
     - curves_enforce_zeroorpositivelastslope_output_1
     - vector
     - Processed curve group with the same structure as the input but with all terminal slopes guaranteed to be zero or positive, ready for downstream solver or calibration workers.

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

- data.curve.transform
- engineering.material.calibration

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

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

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_enforce_zeroorpositivelastslope</code>. Schema hash: <code>c7a11e10a6f4</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
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