OOP: passing arguments to a handle class method

Hi,

I'm writing a method that takes a double data type (from a property of a local class object) and then does some calculations with it:

        function Err = OutOfBoundsCorrection(obj)
            % determine error to add to species for exceeding system limits
            ErrorVal = zeros(2,2);                          % initialise array to hold error values
            ErrorVal(1,1) = HeightCorrection(obj.SimTankA.Height);     % error from tank A height being too low or high
            ErrorVal(2,1) = TempCorrection(obj.SimTankA.Temp);       % error from tank A temp being too low or high
            ErrorVal(1,2) = HeightCorrection(obj.SimTankB.Height);     % error from tank B height being too low or high
            ErrorVal(2,2) = TempCorrection(obj.SimTankB.Temp);       % error from tank B temp being too low or high
            Err = sum(ErrorVal);                            % sum errors together
        end

        function ErrorVal = HeightCorrection(tank)
            % determine error from tank height approaching or exceeding bounds
            if (tank < 0.2)                        % fluid height is below 0.2 metres -> MIN 0
                ErrorVal = 100 * 1/tank;              % inverse of height by an arbitary penalty
            else if (tank > 2.3)                   % fluid height is above 2.3 metres - > MAX 2.5
                ErrorVal = 10000 * (tank - 2.3);      % remove offset and multiply by arbitrary penalty
                end
            end
        end

However i keep getting an error message from matlab: 'Undefined function 'HeightCorrection' for input arguments of type 'double'. Not sure what's causing this. Something to do with the way I'm calling the property, or writing the argument term in the method?

Has anyone got suggestions?

Answer 1

[per isakson]

I assume that

1. function ErrorVal = HeightCorrection(tank)
2. function Err = OutOfBoundsCorrection(obj)

each defines a method (not static) of a class. If so the syntax of the call should be

    ErrorVal(1,1) = HeightCorrection( obj, obj.SimTankA.Height );

or

    ErrorVal(1,1) = obj.HeightCorrection(obj.SimTankA.Height);

and the signature of the method should be

    function ErrorVal = HeightCorrection( obj, tank )

.

It is possible to keep the code as is and make, HeightCorrection, an ordinary separate function.

[Manish Makwana]

Thank you so much! This seems to have done the trick :)