Warning: Struct field assignment overwrites a value with class "function_handle".

Hello,

I'm building a GUI where I would like to let the user choose two functions, the first one is shotrad.m and the second one is IFOModel.m. The function shotrad.m that takes as input frequency f and IFOModel. IFOModel is function that has some constants in it. Therefore, when evaluating the function, it should look like: shotrad(f,IFOModel). So far the code looks like this

    %add shotrad file
    [shotradf,shotradpath] = uigetfile('*.m','Select the Shotrad code file'); %let the user choose the shotrad file
    shotrad_file=shotradf(1:length(shotradf)-2); %eliminate .m from string
    addpath(shotradpath); %add path of file

    % add IFOModel file
    [ifof,ifopath] = uigetfile('*.m','Select the IFOModel code file'); %let the user choose the IFOModel file
    ifo_file=ifof(1:length(ifof)-2); %eliminate .m from string
    addpath(ifopath); %add path of file

    %now use str2func convert strings to functions
    shotrad = str2func(shotrad_file);
    IFOModel = str2func(ifo_file);

    %evaluate the function, here's where the problem is
    n=shotrad(f,IFOModel);
  end

In the last step, where I try to evaluate n, I get the warning: Warning: Struct field assignment overwrites a value with class "function_handle", and after that, it will drop an error: ??? Reference to non-existent field 'Constants'.

the function IFOModel has the following structure

function ifo=IFOModel(varargin)
  ifo.Constant.c=3e8
  %and it has other constants included as structure
end

Why am I getting this problem and how can I fix it. Thank you!

[Guillaume]

The problem is within shotrad itself. So, show that code.

Doesn't the error shows the line where it occurs?

[Walter Roberson]

You mention that the error has to do with the field "Constants" but your IFOModel has a field "Constant" so perhaps you have a problem with inconsistent field names.