cfit

Constructor for cfit object

Syntax

cfun = cfit(ffun, coeff1,...,coeffn)

Description

cfun = cfit(ffun, coeff1,...,coeffn) constructs the cfit object cfun using the model type specified by the fittype object ffun and the coefficient values coeff1, coeff2, etc.

Note

cfit is called by the fit function when fitting fittype objects to data. To create a cfit object that is the result of a regression, use fit.

You should only call cfit directly if you want to assign values to coefficients and problem parameters of a fittype object without performing a fit.

Methods of cfit objects:

argnames	Input argument names of cfit, sfit, or fittype object
category	Category of fit of cfit, sfit, or fittype object
cfit	Constructor for cfit object
coeffnames	Coefficient names of cfit, sfit, or fittype object
coeffvalues	Coefficient values of cfit or sfit object
confint	Confidence intervals for fit coefficients of cfit or sfit object
dependnames	Dependent variable of cfit, sfit, or fittype object
differentiate	Differentiate cfit or sfit object
formula	Formula of cfit, sfit, or fittype object
indepnames	Independent variable of cfit, sfit, or fittype object
integrate	Integrate cfit object
islinear	Determine if cfit, sfit, or fittype object is linear
numargs	Number of input arguments of cfit, sfit, or fittype object
numcoeffs	Number of coefficients of cfit, sfit, or fittype object
probnames	Problem-dependent parameter names of cfit, sfit, or fittype object
probvalues	Problem-dependent parameter values of cfit or sfit object
setoptions	Set model fit options
type	Name of cfit, sfit, or fittype object

Examples

Construct a cfit object from a fittype object

Create a fittype object and call the cfit function.

f = fittype('a*x^2+b*exp(n*x)')
c = cfit(f,1,10.3,-1e2)

f =
     General model:
       f(a,b,n,x) = a*x^2+b*exp(n*x)
c =
     General model:
       c(x) = a*x^2+b*exp(n*x)
     Coefficients:
       a =           1
       b =        10.3
       n =        -100

Input Arguments

ffun — Model type

fittype (default)

Model type the cfit function uses to construct the cfit object, specified as a fittype constructed with the fittype function.

Example: fittype('poly2')

coeff1,...,coeffn — Coefficient values

scalar (default)

Coefficient values of the cfit object, specified as scalars.

Data Types: single | double

Output Arguments

cfun — cfit object

cfit

Function output, returned as a cfit object.

Version History

Introduced before R2006a