problem saving array data into cell in every for loop

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mikel lasa 2022-2-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1644060-problem-saving-array-data-into-cell-in-every-for-loop

评论： mikel lasa 2022-2-6

Hello,

Im struggling with how to save values into a cell. My script loops 1500 times and in every loop it calculates a 6x1 array. I want to save each array value into a 6x1 cell, being each cell of length 1500.

I've tried using num2cell function but it doesnt work for me... Help me please!

The script is quite long so I have uploaded only the function that calculates what need to calc, dont know if it would be enough.

for i=1:1500
            % previous operations...
    
            %qdds is a 6x1 array calculated each loop
            qdds = M\(torque-E2);
            qdds= num2cell(qdds);
            for indx=1:6
                % I want to save qdds as a 6x1 cell, and save each array
                % value into each cell for every loop
                qdds{indx}(1,i)=qdds{indx}(1,i);
                
                %s ave qds as last value qds value + Δt*qdds
                qds{indx}(1,i)=qds{indx}(1,i)+deltaT*qdds{indx}(1,i);
                % 
                qs{indx}(1,i)=qs{indx}(1,i)+deltaT*qds{indx}(1,i);
            end  
            
end

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Answer 1

DGM 2022-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/1644060-problem-saving-array-data-into-cell-in-every-for-loop#answer_889920

编辑：DGM 2022-2-6

在 MATLAB Online 中打开

I don't see why you need to complicate things with a cell array when a numeric array seems like it would work fine.

numops = 1500;
% orient qdarray whichever way you want
qdarray = zeros(6,numops);
for k = 1:numops
    % do some stuff
    
    % get a 6x1 numeric vector
    qdds = rand(6,1);
    
    % put it in the output array
    qdarray(:,k) = qdds;
end

If you really want a cell array, you can.

% if you really want a cell array
qdarray = num2cell(zeros(6,numops),2);
for k = 1:numops
    % do some stuff
    
    % get a 6x1 numeric vector
    qdds = rand(6,1);
    
    % put it in the output array
    for ko = 1:6
        qdarray{ko}(k) = qdds(ko);
    end
end

Or even simpler:

% orient qdarray whichever way you want
qdarray = zeros(6,numops);
for k = 1:numops
    % do some stuff
    
    % get a 6x1 numeric vector
    qdds = rand(6,1);
    
    % put it in the output array
    qdarray(:,k) = qdds;
end
qdarray = num2cell(qdarray,2);