How to loop through a set of variables Y1..Y100

Question

Ahmed AKL 2018-2-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385538-how-to-loop-through-a-set-of-variables-y1-y100

编辑： Stephen23 2019-6-27

采纳的回答： Stephen23

Hi,

I've a group of matrix named Y1 .. Y100. Each matrix is 7244x1 (complex number).

I want to loop through them (Y1..Y100) so in each iteration I can plot the 7244x1 values.

How can I iterate through them?

Thanks in advance

6 个评论
显示 4更早的评论隐藏 4更早的评论

Ahmed AKL 2018-3-1

Sure, it will be nice if you can find a way to import the data in a better format.

The analyzer captures the RF signal and exports it to a .mat file (it doesn't give me any option to configure the format). Then I go to Matlab and load the .mat file, so I've a punch of data in my workspace as I explained in the question.

Do you have a solution for this?

Stephen23 2018-3-1

编辑：Stephen23 2018-3-1

"Do you have a solution for this?"

Yes, as I already wrote, just load the data into a variable. This was also explained in the tutorial that I gave you a link to: did you read it? See my answer for how this can be applied to your situation.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Stephen23 2018-3-1

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385538-how-to-loop-through-a-set-of-variables-y1-y100#answer_307783

编辑：Stephen23 2019-6-27

在 MATLAB Online 中打开

"it will be nice if you can find a way to import the data in a better format."

Of course, it is simpler and more efficient to load into an output a structure and then access its fieldnames:

figure()
hold on
S = load(...);
For k = 1:100
    plot(real(S.(sprintf('Y%d',k))))
end

So easy! By simply avoiding eval I wrote more efficient code using fewer characters: when beginners learn to avoid eval then they also write simpler, less buggy, more efficient code:

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

jonas 2018-2-28

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/385538-how-to-loop-through-a-set-of-variables-y1-y100#answer_307721

编辑：jonas 2018-3-1

在 MATLAB Online 中打开

Try this:

figure;hold on
    for i=1:100;
    plot(eval(sprintf(['Y',num2str(i)])));
    end

For more info: https://se.mathworks.com/matlabcentral/answers/57445-faq-how-can-i-create-variables-a1-a2-a10-in-a-loop

EDIT: For future reference, Stephen gave a better solution below. Only use EVAL() if it is absolutely necessary (which it rarely is, if ever?). See link for more info.