plotting a struct in a loop

Question

Benjamin 2018-11-9

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429024-plotting-a-struct-in-a-loop

编辑： madhan ravi 2018-11-12

采纳的回答： Image Analyst

在 MATLAB Online 中打开

I have this code:

semilogy(S.A600(:,1),S.A600(:,2));

I also want to plot S.A601 up to S.A620

This does not work:

for i = 1:1:20
semilogy(S.A60(i)(:,1),S.A60(i)(:,2));
hold on
end

How can I loop through each one or do I have to manually type each plot command ?

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Stephen23 2018-11-10

Use dynamic fieldnames:

https://www.mathworks.com/help/matlab/matlab_prog/generate-field-names-from-variables.html

Note that your code would be simpler and more efficient if you just used a non-scalar structure:

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

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Answer 1

Image Analyst 2018-11-9

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/429024-plotting-a-struct-in-a-loop#answer_346135

在 MATLAB Online 中打开

Try this:

% S.A601 = rand(10, 2); % Create sample data.
% S.A602 = rand(10, 2);
% S.A603 = rand(10, 2);
% S.A604 = rand(10, 2);
% S.A605 = rand(10, 2);
% S.A606 = rand(10, 2);
fn = fieldnames(S)
for k = 1:length(fn)
  thisS = S.(fn{k})
  x = thisS(:, 1);
  y = thisS(:, 2);
  fprintf('Printing field #%d.\n', k);
  semilogy(x, y);
  hold on
  drawnow;
end
grid on;

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Benjamin 2018-11-12

编辑：madhan ravi 2018-11-12

your answer worked great! now that I have tried loading the data in with a loop, it does not seem to work. Could you check here and maybe see where my mistake is? https://www.mathworks.com/matlabcentral/answers/429433-loading-in-excel-data-with-loop-and-plotting

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