.. _auto_curve_create_from_expression:

*COMPUTES KEY VALUES SUCH AS YIELD, NECKING ETC.*
=================================================

Generates a new XY curve by evaluating a user-supplied C-syntax mathematical expression over a defined x-axis range and increment. Use this worker whenever you need a synthetic curve from a formula — e.g., a sine wave, polynomial, or any parameterized function — rather than measured data.

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

Classification: **process**.

Tagged: ``c-syntax``, ``create``, ``curve``, ``expression``, ``formula``, ``intrinsic``, ``math``, ``synthetic``.

Inputs
------

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

   * - Label
     - ID
     - Type
     - Default
     - Required
     - Description
   * - Expression
     - expression
     - textarea
     - —
     - 
     - C-syntax mathematical expression defining y as a function of x (and any named inputs); intrinsic functions such as sin, cos, min, max, maxg are supported — e.g., 'A*sin(B*x)'. Leave blank only if the expression is trivially zero.
   * - xmin
     - xmin
     - scalar
     - 0
     - 
     - Starting x-axis value for curve generation (dimensionless or in whatever unit x represents); defaults to 0.
   * - xmax
     - xmax
     - scalar
     - 1
     - 
     - Ending x-axis value for curve generation; must be greater than xmin. Defaults to 1.
   * - xinc
     - xinc
     - scalar
     - 0.1
     - 
     - Step size between consecutive x points; controls curve resolution — smaller values produce smoother curves. Defaults to 0.1.
   * - Inputs
     - inputs
     - keyvalue
     - —
     - 
     - Key-value pairs of named scalar constants referenced inside the expression (e.g., A=2.5, B=3.14); omit if the expression contains no named parameters beyond x.

Outputs
-------

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

   * - Label
     - ID
     - Type
     - Description
   * - curve_create_from_expression_output_1
     - curve_create_from_expression_output_1
     - vector
     - Generated XY curve vector whose x-values span [xmin, xmax] at step xinc and whose y-values are the result of evaluating the supplied expression at each x point.

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

.. 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_create_from_expression</code>. Schema hash: <code>e8ab84e7fc11</code>. Hand-curated docs in <code>workerexamples/</code> override this page when present.
   </p>