Arrays Matlab中的面向对象编程：为具有负索引的2D阵列创建新类

我不熟悉面向对象编程。这个问题似乎类似于以前提出的问题，但有一个很大的区别，我还没有找到解决办法：

如何使用Matlab中的面向对象编程设置一类新的变量，该类变量的行为类似于矩阵（2D数组…），但行/列的编号为{-2，-1,0,1…}（而不是仅{1,2,3…}）

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我希望能够在这个新类中使用Matlab提供的所有正则向量运算。处理此变量中的值的方法是什么（例如，A[-1,2]=…与普通数组类似？A.-1.2=…？）？我将如何执行简单的A.*B（Matlab中向量的逐元素乘法）？和A（：，5）。*B（-1，：）'

您可以对内置的

double

类进行子类化，该类将为您提供大部分功能。关于索引，您只需编写自己的

subsref

和

subsasgn

方法

由于您已经将

double

子类化，所有正常的矩阵运算（如元素相乘、

cumsum

等）都将继续按预期工作

这样的办法应该行得通

classdef mymatrix < double

    methods
        function self = mymatrix(varargin)
            % Constructor that simply calls the double constructor
            self@double(varargin{:});
        end

        function res = subsref(self, subs)
            % Call the usual subsref after modifying the subscripts
            res = subsref@double(self, correctsubs(self, subs));
        end

        function res = subsasgn(self, subs, val)
            % Call the usual subsasgn after modifying the subscripts
            res = subsasgn@double(self, correctsubs(self, subs), val);
        end
    end

    methods (Access = 'private')
        function subs = correctsubs(self, subs)
            % Function for converting subscripts
            for k = 1:numel(subs)
                % Only process () references and non-linear indices
                if ~isequal(subs(k).type, '()')
                    continue
                end

                % Figure out the center of the matrix
                mid = ceil(size(self) / 2);

                % For each subscript, if it's numeric then add the middle
                % shift amount to it to turn it into a normal subscript
                for m = 1:numel(subs(k).subs)
                    if isnumeric(subs(k).subs{m})
                        subs(k).subs{m} = subs(k).subs{m} + mid(m);
                    end
                end
            end
        end
    end
end

---

您可以对内置

double

类进行子类化，该类将为您提供大部分功能。关于索引，您只需编写自己的

subsref

和

subsasgn

方法

由于您已经将

double

子类化，所有正常的矩阵运算（如元素相乘、

cumsum

等）都将继续按预期工作

这样的办法应该行得通

classdef mymatrix < double

    methods
        function self = mymatrix(varargin)
            % Constructor that simply calls the double constructor
            self@double(varargin{:});
        end

        function res = subsref(self, subs)
            % Call the usual subsref after modifying the subscripts
            res = subsref@double(self, correctsubs(self, subs));
        end

        function res = subsasgn(self, subs, val)
            % Call the usual subsasgn after modifying the subscripts
            res = subsasgn@double(self, correctsubs(self, subs), val);
        end
    end

    methods (Access = 'private')
        function subs = correctsubs(self, subs)
            % Function for converting subscripts
            for k = 1:numel(subs)
                % Only process () references and non-linear indices
                if ~isequal(subs(k).type, '()')
                    continue
                end

                % Figure out the center of the matrix
                mid = ceil(size(self) / 2);

                % For each subscript, if it's numeric then add the middle
                % shift amount to it to turn it into a normal subscript
                for m = 1:numel(subs(k).subs)
                    if isnumeric(subs(k).subs{m})
                        subs(k).subs{m} = subs(k).subs{m} + mid(m);
                    end
                end
            end
        end
    end
end

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请参阅：请参阅：@user1611107更新为

subsasgn

aswell@user1611107更新时还修改了

subsasgn