.. _auto_curve_regression_smooth: *REGRESSION BASED SMOOTHING OF CURVE* ===================================== Smooths a curve using locally-weighted regression (LOESS), fitting a polynomial of selectable order within a sliding window whose size is expressed as a percentage of total points. Supports multiple smoothing iterations, tri-cube or linear weighting schemes, and optional derivative-domain smoothing. When to use ----------- Classification: **process**. Tagged: ``curve_smoothing``, ``locally_weighted_regression``, ``loess``, ``lowess``, ``polynomial_fit``, ``regression_smooth``, ``signal_smoothing``, ``transformations``. Inputs ------ .. list-table:: :header-rows: 1 :widths: 20 20 20 20 20 20 * - Label - ID - Type - Default - Required - Description * - Curve In - curve_in - vector - — - - Input curve (X/Y vector) to be smoothed; accepts any dimensioned time-history or force-displacement curve. * - Percentage Of Points - percentageof_points - scalar - 5 - - LOESS window size as a percentage of total points (default 5 = 5%); if a negative value is supplied it is interpreted as an absolute point count instead. * - Weight Type - weight_type - scalar - linear - - Weighting kernel applied to points within the local window — 'linear' (default) for linear decay, 'tri-cube' for the standard LOESS tricube kernel, which down-weights outliers more aggressively. * - Iterations - iterations - scalar - 1 - - Number of successive LOESS smoothing passes applied to the curve (1–10); default is 1; higher values increase smoothing at the cost of detail. * - Order Of Fit - orderof_fit - scalar - 1 - - Order of fit. Linear is a good default * - Digitize - dig_points - scalar - 100 - - No. of points in final output curve * - Retain First Point - retain_first_point - string - yes - - Option to always retain the first raw x and y points for the output curve * - Optimize - optimize - string - no - - Optimize smoothing; Find the optimal values to provide the best smoothing globally or locally * - Digitize - digitize - string - yes - - No. of points in final output curve * - Use Derivative For Smoothing - smooth_derivative - string - no - - Smooth derivative and then integrate * - Derivative Threshold - derivative_th - scalar - 0 - - High derivative points larger than this factor over the range of the derivative will be skipped for smoothing. A value of 0.2-0.3 is recommended for stress vs strain curves * - Ratio Of Difference - ratio_max - scalar - 0 - - If the new smoothed value is out of this ratio, the original value will be used * - Optimize Locally (Deprecated) - optimize_locally - string - no - - Based on the window-size, optimize locally. Retained for backward compatibility. * - Choose Optimization Parameters (Deprecated) - optimize_params - string - no - - Limit optimization to these. If not selected, all options will be used for optimization * - Use Variable Window Size - use_variable_window_size - string - no - - This helps in a variable window size that is useful for highly varying derivative * - Start X - start_x - string - — - - Only Smooth points whose X-value is greater than this value * - Max Window Size - max_ws - string - 8 - - Used when variable window size is specified * - Use Variable Order - use_variable_order - string - no - - This helps in a variable order for nonlinear curve * - Max Order Size - max_order - string - 3 - - Used when variable order is specified * - Use Shadow Points - use_shadow_points - string - no - - This helps in more accurate boundary points Outputs ------- .. list-table:: :header-rows: 1 :widths: 20 20 20 20 * - Label - ID - Type - Description * - curve_regression_smooth_output_1 - curve_regression_smooth_output_1 - vector - Smoothed output curve (X/Y vector) with the same domain as the input curve, transformed by the LOESS regression pass(es). 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=curve_regression_smooth `_ .. raw:: html

Auto-generated from transformation schema. Worker id: curve_regression_smooth. Schema hash: 99c8d98c8cf6. Hand-curated docs in workerexamples/ override this page when present.