Create legend within a for loop but with changing size of plot handles

Question

Konstantinos Tsitsilonis 2017-6-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346735-create-legend-within-a-for-loop-but-with-changing-size-of-plot-handles

评论： Walter Roberson 2017-6-29

Hi all,

I have a plot within a for loop, plotting 22 line objects on the first run (i=1) and 28 line objects on the second run (i=2). I would like to have a legend that has the a line object from the first run and a line object from the second run.

Sounds simple, however as the handle sizes are changing, i cant seem to be able to save them in a cell array so that I can call them afterwards e.g.:

 for i=1:2
    hold on
    p(:,i) = {plot(...22 line objects for i=1 and 28 for i=2...)} ;
    hold off
 end
 legend([p(1,1) p(1,2)],'first run','second run')

The result is a cellarray p={[epmty] [28x1 line objects]} which means that for some reason the handles from the first run are not being saved.

Thanks for your help in advance,

KMT.

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Adam 2017-6-29

在 MATLAB Online 中打开

p{i} = plot(...)

would seem a more obvious way to fill a cell array, though whether this will solve the problem or not I don't know. I don't see why your first element would be empty other than because the plotting of 22 objects is not actually returning any handles, which will be the same whatever assignment syntax you use.

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Answer 1

Walter Roberson 2017-6-29

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/346735-create-legend-within-a-for-loop-but-with-changing-size-of-plot-handles#answer_272341

在 MATLAB Online 中打开

 for i=1:2
    hold on
    p{i} = {plot(...22 line objects for i=1 and 28 for i=2...)} ;
    hold off
 end
 legend([p{1}(1), p{2}(1)], 'first run', 'second run')