.. _auto_curves_downsize:

*CURVE DOWNSIZE*
================

Reduces the number of points in one or more curves using a band-size tolerance algorithm, iteratively removing points whose deviation falls within the specified band. Use this worker to compress large time-history or signal curves while preserving their essential shape.

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

Classification: **process**.

Tagged: ``band_size``, ``curve_compression``, ``downsample``, ``downsize``, ``point_reduction``, ``time_history``.

Inputs
------

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   :widths: 20 20 20 20 20 20

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Curves
     - curves
     - vector
     - —
     - 
     - One or more input curves (time-history or XY pairs) to be down-sampled; accepts multiple curve objects in vector format.
   * - Band Size
     - band_size
     - scalar
     - 0.005
     - 
     - Tolerance band controlling how aggressively points are removed — smaller values (e.g. default 0.005) retain more points; increase to reduce the output point count further.
   * - Num Iterations
     - num_iterations
     - scalar
     - 1
     - 
     - Number of downsizing passes to apply; default is 1 — increase for more aggressive reduction at the cost of shape fidelity.
   * - Window Sizer
     - window_size
     - scalar
     - 0
     - 
     - Time interval (when window_type='value') or point count (when window_type='length') over which the derivative range is computed; default 0 disables windowing.
   * - Window Type
     - window_type
     - scalar
     - value
     - 
     - Determines how window_size is interpreted: 'value' treats it as a physical time/x-axis interval, 'length' treats it as a fixed number of points; default is 'value'.

Outputs
-------

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   :header-rows: 1
   :widths: 20 20 20 20

   * - Label
     - ID
     - Type
     - Description
   * - curves_downsize_output_1
     - curves_downsize_output_1
     - vector
     - Down-sampled version of the input curve(s) in vector format, with redundant interior points removed according to the band-size tolerance and iteration settings.

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

.. raw:: html

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   Auto-generated from <code>transformation</code> schema. Worker id: <code>curves_downsize</code>. Schema hash: <code>114a22c78dad</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>