MATLAB: Object Oriented Programming – Leaving properties from objects empty.

Question

Hi everybody! I am writing the following code:

    classdef Value0_1
        properties
            Price
            Earnings
            ddd
            BookValue
            P_E_Calc
            P_B_Calc
        end
        methods
            function PE=Value0_1(price,earnings,Ddd)
                if nargin <2
                    PE.Price=price;
                    PE.Earnings=earnings;  
                    PE.ddd=Ddd;
                end
            end
        end
    end

Now, I would like to create an object by typing in the command Window PriceEarnings=Value0.1(555,555,~). the following error comes: Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched delimiters.

–> How can I leave the argument Ddd empty?

Answer 1

The call should look like PriceEarnings=Value0_1(555,555) and the code for the constructor should look like,

             function PE=Value0_1(price,earnings,Ddd)
                if nargin >=1
                    PE.Price=price;
                end
                if nargin>=2
                    PE.Earnings=earnings;
                end  
                if nargin>=3
                    PE.ddd=Ddd;
                end
            end