Overloaded feval function with cfit object when using Compiler

I'm attempting to compile an m-file that uses the overloaded feval or predict MATLAB functions.

My code currently evaluates a cfit object loaded from a .mat file the following way:

load some_cfit_object.mat
y = feval(some_cfit_object, x);

This works perfectly fine in MATLAB. However, once compiled, I get the following error when running the dll:

"Function to evaluate must be represented as a string scalar, character vector, or function_handle object".

This happens, because the MCR is using the generic feval function instead of the @cfit/feval function.

What is the best way to solve this issue?

Answer 1

[Benjamin Thompson]

The dependency scanner cannot look into arguments passed to feval very well, per the MATLAB Compiler User Guide. Use the %#function directive in your code to explicitly list dependencies on functions or class types that feval will use.

[Nicolas Hinze]

Thank you. I did read through that, but I do not understand the syntax to specfify the feval.m from the CurveFit function. The following has no effect:

%#feval

[Benjamin Thompson]

In your M flie add something like

%#function function_name
%#function class_name

Here, class_name might be the class type of the object from the MAT file that you are passing to feval. It is not clear from your description what that class type is.

[Nicolas Hinze]

The following is needed to use feval with a cfit object:

%#function feval
%#function cfit