.. _auto_curve_drop_if_positive:

*DROP POSITIVE POINTS*
======================

Filters a curve by removing all data points where the Y-value is positive, retaining only zero and negative values. Use this worker to isolate compressive or negative-phase portions of a time-history or load curve.

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

Classification: **process**.

Tagged: ``curve``, ``drop``, ``filter``, ``negative``, ``positive``, ``time-history``, ``transform``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves
     - curve
     - vector
     - —
     - 
     - Input curve whose positive Y-value points will be removed; accepts a single X-Y vector curve (e.g. a force or displacement time-history). Optional — leave unconnected only if the curve is injected upstream.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_drop_if_positive_output_1
     - curve_drop_if_positive_output_1
     - vector
     - Filtered output curve containing only the points from the input curve where the Y-value is zero or negative; same X-Y vector format as the input.

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

.. 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_drop_if_positive</code>. Schema hash: <code>887aeb698c4e</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>