How to call matlab class method from simulink

I want to use functions/methods from matlab class in Simulink simulation. matlab Function Block contains:

function y = fcn(u)
    y = dsp.calc_val(u);
end

dsp is an instance of class t_dsp, method calc_val is defined and can be called from matlab workspace,

classdef t_dsp < handle 
methods(Access = public)      
    function out = calc_val(obj, x)
        out = obj.some_value + x * 2;
    end        
end

but Simulink produces this error message:

Undefined function or variable 'dsp.calc_val'

Class instance is not visible from the matlab Function Block. I don't want to go for 'MATLAB System' class, I want to re-use already existing matlab class. How it can be done?

Answer 1

[Mark McBroom]

function y = fcn(u)

dsp = t_dsp;

y = dsp.calc_val(u);

end