Smoothing

Fit using smoothing splines and localized regression, smooth data with moving average and other filters

Smoothing is a method of reducing the noise within a data set. Curve Fitting Toolbox™ allows you to smooth data using methods such as moving average, Savitzky-Golay filter and Lowess models or by fitting a smoothing spline.

Smooth data interactively using the Curve Fitting app or at the command line using the smooth function. For an example showing how to smooth data, see Fit Smooth Surfaces To Investigate Fuel Efficiency.

Apps

Curve Fitting

Fit curves and surfaces to data

Functions

`datastats`	Data statistics
`excludedata`	Exclude data from fit
`fit`	Fit curve or surface to data
`fittype`	Fit type for curve and surface fitting
`fitoptions`	Create or modify fit options object
`get`	Get fit options structure property names and values
`set`	Assign values in fit options structure
`smooth`	Smooth response data
`prepareCurveData`	Prepare data inputs for curve fitting
`prepareSurfaceData`	Prepare data inputs for surface fitting

Topics

Smoothing Splines

Fit smoothing splines in Curve Fitting app or with the fit function to create a smooth curve through data and specify the smoothness.

Lowess Smoothing

Fit smooth surfaces to your data in Curve Fitting app or with the fit function using Lowess models.

Filtering and Smoothing Data

Use the smooth function to smooth response data, using methods for moving average, Savitzky-Golay filters, and local regression with and without weights and robustness (lowess, loess, rlowess and rloess).

Fit Smooth Surfaces To Investigate Fuel Efficiency

This example shows how to use Curve Fitting Toolbox™ to fit a response surface to some automotive data to investigate fuel efficiency.

Nonparametric Fitting

Nonparametric fitting to create smooth curves or surfaces through your data with interpolants and smoothing splines.

Featured Examples

Fit Smooth Surfaces To Investigate Fuel Efficiency

Use Curve Fitting Toolbox™ to fit a response surface to some automotive data to investigate fuel efficiency.

Open Script

Cubic Smoothing Splines

Use the csaps and spaps commands from Curve Fitting Toolbox™ to construct cubic smoothing splines.

Open Live Script