Trying to cycle through my variables with a for loop.

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matlabuser12 2015-6-10

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https://ww2.mathworks.cn/matlabcentral/answers/223295-trying-to-cycle-through-my-variables-with-a-for-loop

回答： Star Strider 2015-6-10

for i=1:20
Data = sprintf('Data%i',i);
DataNew(:,i) = mean(Data);
end

I have 20 Data arrays labeled Data1-Data20 and want to cycle through them in a for loop and do some calcs like mean, or run them all through a formula. But I keep getting errors that the Data is a char, how do I do this correctly?

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Answer 1

Star Strider 2015-6-10

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I would do it in two steps, first to create a cell array from the individual arrays (so you don’t have to go through that step ever again), and second, calculate the means:

Data1 = randi(10, 5, 1);                    % Create Data
Data2 = randi(10, 7, 1);
N = 2;
for k1 = 1:N
    Data{k1} = eval(sprintf('Data%d',k1));  % Create Cell Array From Individual Arrays
end
for k1 = 1:size(Data,2)
    DataNew(k1) = mean(Data{k1});
end