.. _auto_curves_failurepoint_yrange:

*COMPUTE THE TIME AT WHICH THE Y REACHES A GIVEN VALUE FOR A SUSTAINED PERIOD*
==============================================================================

Scans one or more curves and identifies the first x-axis point (time) at which the y-value falls within a specified [y-min, y-max] range and remains there for a sustained duration (time window). Use this worker to detect failure onset or threshold-crossing events in time-history signals.

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

Classification: **process**.

Tagged: ``curve_analysis``, ``failure_detection``, ``failure_point``, ``sustained``, ``threshold``, ``time_history``, ``yrange``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves From Which The Failure Point Is To Be Extracted
     - curvesfromwhichthefailurepointistobeextracted
     - vector
     - —
     - 
     - One or more time-history curves (x = time, y = signal) to be scanned for the failure point; accepts multiple curve objects.
   * - Minimum Y-value
     - y-min
     - scalar
     - —
     - 
     - Lower bound of the y-value range (inclusive) that defines the failure condition; must be in the same units as the curve y-axis.
   * - Maximum Y-value
     - y-max
     - scalar
     - —
     - 
     - Upper bound of the y-value range (inclusive) that defines the failure condition; must be in the same units as the curve y-axis.
   * - Time Window
     - timewindow
     - scalar
     - —
     - 
     - Minimum duration (in the same time units as the curve x-axis) for which the y-value must remain within [y-min, y-max] before the point is classified as a failure.
   * - Return Type
     - return_type
     - string
     - count
     - 
     - Controls what value is returned at the failure point: 'xval' returns the x-axis (time) coordinate, 'yval' returns the y-axis value; defaults to 'count'.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curves_failurepoint_yrange_output_1
     - curves_failurepoint_yrange_output_1
     - dataset
     - Dataset containing one row per input curve with the identified failure-point coordinate (x or y value, per return_type) at which the signal first enters and sustains the specified y-range.

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

- data.curve.transform
- data.signal_processing

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

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

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_failurepoint_yrange</code>. Schema hash: <code>16e404d2b94e</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>