Assignment in a for loop

Question

René Lampert 2021-8-19

0
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评论： darova 2021-8-19

Hi,

I think I have a simple problem but I cant handle it to be honest. Here is a minmal example

classdef SoccerLeague<handle

properties

player1=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

player2=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

player3=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

player4=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

% player5=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

% player6=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

% player7=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

% player8=struct('Name','','Position',[],'GP',[],'PF',[],'PA',[],'P',[])

end

methods

function obj=SoccerLeague

players={'Joe','John','Lisa','Tina'};

for ii=1:length(players)

obj.['player' num2str(ii)].Name=players{ii}

end

I have 4 properties (player1 to player 4 )which are structs and in the constructor function I want to assign them the corresponing names which are incorporated in the variable players. I would like to accomplish this with a simple for loop but i have no idea how to loop through the property names player1....player4. Obviously my try above does not work. I also tried to use the eval function but it did not work.

So at the end there should be obj.player1.Name=Joe .... obj.player4.Name=Tina assigned in a for loop.

Any suggestion how to solve this simple looking problem?

Thanks in advance...

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Answer 1

Stephen23 2021-8-19

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编辑：Stephen23 2021-8-19

在 MATLAB Online 中打开

"Any suggestion how to solve this simple looking problem?"

Use a non-scalar structure:

https://www.mathworks.com/help/matlab/matlab_prog/access-multiple-elements-of-a-nonscalar-struct-array.html

Rather than awkwardly and inefficiently forcing meta-data (a pseudo-index) into the property names, a simple non-scalar structure would let you use neat, basic, efficient MATLAB indexing to achieve your goal:

classdef SoccerLeague<handle
    properties
        % Empty structure:
        players = struct('Name',{},'Position',{},'GP',{},'PF',{},'PA',{},'P',{});
    end
    
    methods
        function obj = SoccerLeague
            names = {'Joe','John','Lisa','Tina'};
            for ii = 1:numel(names)
                obj.players(ii).Name = names{ii};
            end
        end
    end
end