Inspection error: Too many arguments

I'm trying to create a class which inherits from the visa class from the Instrument Control Toolbox, such that I can define my own methods and properties.

So far I have the following code:

classdef DAQ970A < visa
    
    methods
        function obj = DAQ970A()          
            obj = obj@visa('keysight', 'USB0::0x2A8D::0x5101::MY58003119::0::INSTR');
        end
    end
end

However, when I try to inspect the class, double clicking it the the workspace tab, I get an error pop-up with the title "Inspection error" and descrption "Too many input arguments". What am I doing wrong?

If I try accessing the properties from the parent class, like so:

Daq = DAQ970A();
Daq.InputBufferSize

I get the following error:

Error using instrument/subsref (line 113)

Too many input arguments.

I suspect these are related.

Answer 1

[Sourabh Kondapaka]

Hi,

I believe the error, "Too many input arguments" could be for either of the following reasons:

• The constructor of the SuperClass "visa" accepts either 0 or 1 arguments.

(or)

• The constructor of the SuperClass "visa" calls another method in its class which accepts 0 or 1 arguments.

If the above 2 reasons does not solve the issue, please upload the code of SuperClass "visa" and also the code at the line 113.

[Bjarke Gårdbæk]

Hi

I have no trouble instantiating the class, so I doubt the error is in the constructor for supreclasses provided in the Instrument Control Toolbox. The problems arrise when I want to inspect an instance of the derived class from the workspace.

However, I have changed the class, so it doesn't inherit from the visa superclass anymore. This fixed my problem.

Thank you for your time.