Method set don't work

Question

Thierry NOVO 2013-7-15

2
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/82086-method-set-don-t-work

I wrote a simple program to understand how to implement a set method. Here is my code. First the class definition:

classdef Material

    properties
        L
        nz
        dz
    end

methods

    function newMat = Material(L, nz)
        if nargin == 2
            newMat.L = L;
            newMat.nz = nz;
            newMat.dz;
        end
    end
    function dz = get.dz(newMat)
        dz = newMat.L/( newMat.nz - 1);
    end
    function newMat = set.dz(newMat,value)
        newMat.dz = value;
    end

end

Then a simple script:

clc; close all; clear all; clear classes;

cm = 1e-02; Mat1 = Material(5*cm,11);

so Mat1.dz is equal to 0.005 But when i want to set Mat1.dz = 0.1, the result remains equal to 0.005. Why the set method doesn't work ?? Thanks in advance for your help

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Answer 1

Lokesh Ravindranathan 2013-7-15

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/82086-method-set-don-t-work#answer_91797

在 MATLAB Online 中打开

Your code is working correctly. The reason why the set method appears like not working is because the get method is dependent on L and nz. Since the values of L and nz are unchanged, the get method always calculates the value of dz and it remains at 0.005, although the set method is used with different values. Consider modifying your code.

Initialize dz when you create the object and always get the current value of dz for display (no calculations).

classdef Material 
    properties
        L
        nz
        dz
    end
methods
    function newMat = Material(L, nz)
        if nargin == 2
            newMat.L = L;
            newMat.nz = nz;
            newMat.dz = L/(nz-1);
        end
    end
    function dz = get.dz(newMat)
        dz = newMat.dz;
    end
    function newMat = set.dz(newMat,value)
        newMat.dz = value;
    end
end
end