Curve Fitting Toolbox

feval

Evaluate a fit result object or a fit type object

Syntax

• f = feval(fresult,x)
  f = feval(ftype,coef1,coef2,...,x)
  

Arguments

fresult	A fit result object.
x	A column vector of values at which fresult or ftype is evaluated.
ftype	A fit type object.
coef1,coef2,...	The model coefficients assigned to ftype.
f	A column vector containing the result of evaluating fresult or ftype at x.

Description

f = feval(fresult,x) evaluates the fit result object fresult at the values specified by x, and returns the result to f. You create a fit result object with the fit function.

f = feval(ftype,coef1,coef2,...,x) evaluates the fit type object ftype using the coefficients specified by coef1, coef2, and so on. You create a fit type object with the fittype function.

Remarks

You can also evaluate a fit result or a fit type object using the following syntax.

• f = fresult(x);
  f = ftype(coef1,coef2,...,x);
  

Example

Create a fit type object and evaluate the object at x using the specified model coefficients.

• x = (0:0.1:10)';
  ftype = fittype('a*x^2+b*x');
  f = feval(ftype,1,2,x);
  

Create a fit result object and evaluate the object over a finer range in x.

• y = x.^2+(rand(size(x))-0.5);
  xx = (0:0.05:10)';
  fresult = fit(x,y,ftype);
  f = feval(fresult,xx);
  

See Also

fit, fittype

excludedata

fit