User`s guide

fittype
4-113
4fittype
Purpose Create a fit type object
Syntax ftype = fittype('ltype')
ftype = fittype('expr')
ftype = fittype('expr','PropertyName',PropertyValue,...)
Arguments
Description
ftype = fittype('ltype') creates the fit type object ftype from the library
model, spline, or interpolant specified by
ltype. You can display the library fit
type names with the
cflibhelp function.
ftype = fittype('expr') creates the fit type object from the expression
specified by
expr. The expression expr represents the custom model you will
use to fit your data. To create a general (nonlinear) custom model, specify the
entire equation as one expression. To create a linear custom model, pass in a
cell array of expressions to
expr but do not include the coefficients. Each
element of the cell array corresponds to one term of the model. If there is a
constant term, use “1” as the corresponding element in the cell array.
By default, the independent variable is assumed to be
x, the dependent
variable is assumed to be
y, there are no problem-dependent variables, and all
other variables are assumed to be coefficients of the model. All coefficients
must be scalars.
'
ltype' The name of a library model, spline, or interpolant.
'expr' An expression representing a custom model.
'PropertyName' The name of a fit type object property.
PropertyValue A valid value for PropertyName.
ftype A fit type object.