How can I pass in an anonymous function into the FITTYPE function in the Curve Fitting Toolbox 1.2 (R2007b) ?

I want to pass in an annonymous function into the FITTYPE function in the Curve Fitting Toolbox 1.2 (R2007b) in a manner similar to passing in the function to the QUAD function. An example code will be as follows:

F = @(x)1./(x.^3-2*x-5);

Q = quad(F,0,2);

Answer 1

[MathWorks Support Team]

The FITTYPE command requires the use of individual parameters unlike for example the function QUAD.

ffun = fittype(expr)

constructs the 'fittype' object 'ffun' for the custom nonlinear model specified by the expression in the string 'expr'. By default, the independent variable is assumed to be 'x' and the dependent variable is assumed to be 'y'. All other variables are assumed to be coefficients. All coefficients must be scalars.

The standard notation for this would be as follows:

function testabc(a,b,c,x) 

ft = fittype('testabc(a,b,c,x)','independent',{'x'},'coefficients',{'a','b','c'})

where the function is passed in as a string.