How do I extract the output equation from a cfit object in Curve Fitting Toolbox 2.0 (R2009a)?

I used the curve fitting tool to generate MATLAB code for the fitting in Curve Fitting Toolbox 2.0 (R2009a). This code contains an object called 'cf_'. I would like to extract the fitted equation from this object, with the fitted values of the parameters? For example, I want to label plots with the equation.

Answer 1

[MathWorks Support Team]

There is no direct way to obtain the equation with the substituted parameter values from the 'cfit' object in Curve Fitting Toolbox 2.0 (R2009a). However, as a workaround, you can generate a string representation of the curve from a 'cfit' object, 'cf':

eq = formula(cf); %Formula of fitted equation

parameters = coeffnames(cf); %All the parameter names

values = coeffvalues(cf); %All the parameter values

for idx = 1:numel(parameters)

      param = parameters{idx};

      l = length(param);

      loc = regexp(eq, param); %Location of the parameter within the string

      while ~isempty(loc)     

          %Substitute parameter value

          eq = [eq(1:loc-1) num2str(values(idx)) eq(loc+l:end)];

          loc = regexp(eq, param);

      end

end