Getting error message "Unable to resolve the name obj.function."

I'm having a problem calling a fuction of a handle from another handle class. Testing the function itself in the command window works fine, but when i call the function from a different class, i get the error message "Unable to resolve the name obj.function". I already tried to restore the default path of matlan as suggested here. Broken down, the code of the two classes looks like this:

1 classdef Filter < handle
2    properties  (Access = private)      
3        f_high = 0; 
4        f_tol = 0;
5    end
6    
7    methods (Access = public)
8        
9        %Construktor
10       function obj = Filter(f_high, f_tol) 
11           obj.setHighFrequencyBorder(f_high);            
12           obj.setFilterTolerance(f_tol);            
13           Signal.checkSamplingFrequency(f_high, f_tol);
14       end
15 end

1 classdef TestSignal < handle
2    
3    properties (Access = private)
4        samplingFrequency = 0;       
5    end
6    
7    methods (Access = private) 
8        %Constructor
9        function obj = TestSignal(samplingFrequency)
10           obj.setSamplingFrequency(samplingFrequency);
11       end
12   end
13   
14   methods (Static) 
15       function inst = getInstance(samplingFrequency)
16           persistent testSignal;
17           if isempty(testSignal)
18               testSignal = TestSignal(samplingFrequency);
19               inst = testSignal;
20           else
21               inst = testSignal;
22           end
23       end  
24   end
25    
26   methods (Access = public) 
27        
28       %Setter
29       function setSamplingFrequency(obj, samplingFrequency)
30           obj.samplingFrequency = samplingFrequency;
31       end
32   end
33 end

The Issue occurs when calling the function in line 13 of the class Filter when calling the function in line 29 of class TestSignal. I've created an object called "Signal", so in theory the class Filter should "know" this funtion.

Class TestSignal is implemented as a Singleton.

Thanks a lot upfront for helping out.

Answer 1

[Walter Roberson]

Your posted code has no property or method named Signal and no global variable by that name. It also does not appear to be somehow nested such that Signal might somehow be defined in an outer scope.

You also do not have a class named Signal that has a static method named checkSamplingFrequency . Instead you have a class named TestSignal that has a static method named getInstance()

[Max Rybarski]

So i have to make the function checkSamplingFrequency static and call it with

TestSignal.checkSamplingFrequency(f_high, f_tol);

in order to work.

Thanks a lot!