Transfer variables within function with different properties.

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BdS 2019-9-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478681-transfer-variables-within-function-with-different-properties

评论： BdS 2019-9-3

Hi,

I wrote the following class code:

classdef Copy_of_getPortRawData
    
    properties
        PortMembers
        PortWeights
    end
    
    methods
        function obj=getPortRawData(c,PortID,Dates)
            obj=getPortMembers(obj,c,PortID,Dates);   
            obj=getPortWeights(obj,Dates);
        end
        
        % 1)
        function obj=getPortMembers(obj,c,PortID,Dates)
            % Define input parameters
            portField={'PORTFOLIO_MWEIGHT'};
            override={'REFERENCE_DATE'};
            nDates=size(Dates,1);
            rawPortData=cell(nDates,1);
            
            % start downloading raw portfolio data
            for r=1:nDates
                rawPortData{r}=portfolio(c,PortID,portField,override,datestr(Dates(r,1),'yyyymmdd'));
                % simplify data storage structure and delete first row
                rawPortData{r}=rawPortData{r,1}.PORTFOLIO_MWEIGHT{1,1};
                % find unique portfolio members
                if r==1
                obj.PortMembers=rawPortData{r}(:,1);
                else
                obj.PortMembers=union(obj.PortMembers,rawPortData{r}(:,1),'sorted');
                end
            end
        end
         
        % 2)   
            function obj=getPortWeights(obj,Dates)    
            % construct matrix of weights for each portfolio member and each date
            nPortMembers=size(obj.PortMembers,1);
            obj.PortWeights=zeros(nDates,nPortMembers);
            nDates=size(Dates,1);
            
            for r=1:nDates
                ind=ismember(obj.PortMembers,rawPortData{r}(:,1));
                obj.PortWeights(r,ind)=transpose(cell2mat(rawPortData{r}(:,2)));
            end
        end      
    end    
end

My question refers to the code after the line with text % 2)

How does the code look like if I want to work with the variable "rawPortData" coming from the function under the line % 1)?

thanks a lot in advance for your reply.

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Answer 1

Adam 2019-9-3

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/478681-transfer-variables-within-function-with-different-properties#answer_390182

Either return it as an output argument from the previous function and pass it in as an input argument or store it as a class property.

[obj, rawPortData] =getPortMembers(obj,c,PortID,Dates)
obj=getPortWeights(obj,Dates, rawPortData);

or

obj.rawPortData{r} = ...

and add it to the properties list, though put it in a private access block, not a general access block, if you want to be neat.

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BdS 2019-9-3

Hi Adam

Thank you for your answer. The first version is from my point of view better as rawPortData gets big as the Dates gets big.

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