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线性和非线性回归

用线性或非线性库模型或自定义模型进行曲线或曲面拟合

回归是一种估计一个响应（输出）变量和一个或多个预测变量（输入）变量之间关系的方法。您可以使用线性和非线性回归来预测、预报和估计观察到的数据点之间的值。Curve Fitting Toolbox™ 函数允许您通过使用线性和非线性模型库或自定义方程对数据进行曲线或曲面拟合来执行回归。

您可以使用曲线拟合器以交互方式对数据进行曲线和曲面拟合。有关详细信息，请参阅曲线拟合。您还可以在命令行中使用 fit 函数对一组数据进行曲线或曲面拟合。有关简单示例，请参阅Polynomial Curve Fitting。

App

曲线拟合器对数据进行曲线和曲面拟合

函数

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excludedataExclude data from fit
fit对数据进行曲线或曲面拟合
fittypeFit type for curve and surface fitting
fitoptionsCreate or modify fit options object
prepareCurveData Prepare data inputs for curve fitting
prepareSurfaceDataPrepare data inputs for surface fitting
argnames cfit、sfit 或 fittype 对象的输入参数名称
categorycfit、sfit 或 fittype 对象的拟合类别
coeffnamescfit、sfit 或 fittype 对象的系数名称
coeffvaluescfit 或 sfit 对象的系数值
dependnamesDependent variable of cfit, sfit, or fittype object
fevalEvaluate cfit, sfit, or fittype object
formulacfit、sfit 或 fittype 对象的公式
getGet fit options structure property names and values
indepnamesIndependent variable of cfit, sfit, or fittype object
islinearDetermine if cfit, sfit, or fittype object is linear
numargsNumber of input arguments of cfit, sfit, or fittype object
numcoeffsNumber of coefficients of cfit, sfit, or fittype object
probnamesProblem-dependent parameter names of cfit, sfit, or fittype object
setAssign values in fit options structure
setoptions Set model fit options
typecfit、sfit 或 fittype 对象的名称

主题

教程

  • 参数化拟合
    查找曲线拟合器和 fit 函数的所有库模型类型，设置拟合选项，并优化起点。
  • Introduction to Least-Squares Fitting
    Perform least-squares fitting by using error distributions and linear, weighted, robust, and nonlinear least squares.
  • Polynomial Models
    Fit polynomials in the Curve Fitter app or with the fit function.
  • Exponential Models
    Fit exponential models in the Curve Fitter app or with the fit function.
  • Fit Fourier Models
    Fit Fourier series models in the Curve Fitter app or with the fit function.
  • 高斯模型
    在曲线拟合器中或使用 fit 函数拟合高斯模型。
  • Power Series
    Fit power series models in the Curve Fitter app or with the fit function.
  • Rational Models
    Fit rational polynomial models in the Curve Fitter app or with the fit function.
  • Sum of Sines Models
    Fit sum of sines models in the Curve Fitter app or with the fit function.
  • Weibull Distributions
    Fit Weibull distribution models in the Curve Fitter app or with the fit function.
  • Custom Models
    If the Curve Fitting Toolbox library does not contain a desired parametric equation, you can create your own custom equation.
  • Custom Linear Fitting
    In the Curve Fitter app, you can use the Custom Equation fit to define your own linear or nonlinear equations.

工具工作流

编程工作流