Holding legend with multiple plots

Question

ma sd 2020-6-14

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https://ww2.mathworks.cn/matlabcentral/answers/547887-holding-legend-with-multiple-plots

评论： Walter Roberson 2020-6-22

I am using app designer and I have a plot that takes input from the interface then plots it. each time I am plotting, I'm holding the uiaxis on to keep previous plots. however I am not able to get the legend to update and maintain previous components. is it possible to do it?

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Ajay Kumar 2020-6-14

why dont you write legend command after plotting all the plots?

ma sd 2020-6-16

it's not predetermined I am exploring multiple variations of weights for my model then plotting them in the app

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Answer 1

Suhas Maddi 2020-6-18

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Hii,

I think You are trying to store the legend values for each iteration and add new values to that legend.

There are two ways to do so :

Use a cell array of character vectors or string array or categorical array and append your new legend values to this cell array and plot the legend for every iteration.
You can use legappend function as mentioned here: https://blogs.mathworks.com/pick/2014/07/25/append-entries-to-a-legend/

Hope this helps you.

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ma sd 2020-6-21

how would you go about creating the array and appending it to include new plots?

legappend didn't work for me as matlab didn't recognize it

Walter Roberson 2020-6-22

You would need to install legappend from https://www.mathworks.com/matlabcentral/fileexchange/47228-legappend or from the Add-On Explorer.

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Answer 2

Suhas Maddi 2020-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/547887-holding-legend-with-multiple-plots#answer_455281

在 MATLAB Online 中打开

Hii ma sd,You can do something like this :

>>X=1:10;
>>Y=5:5:50;
>>Z=10:10:100;
>>labels={};
>>plot(X,Y);
>>labels{end+1}='label1';
>>legend(labels);
>>hold on
>>plot(X,Z);
>>labels{end+1}='label2';
>>legend(labels);
>>hold off