Legend inside for loop

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danel james 2022-8-4

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1773600-legend-inside-for-loop

评论： Walter Roberson 2022-8-4

Hello,

I want to generate single legend outside for the figure window for all subplots. I am doing plots inside a loop like this:

t,x and y are given datas

for i=1:10
    figure()
    subplot(2,2,i)
    plot(x,y)
    hold on
    plot(t,y)
    subplot(2,2,i)
    plot(x,y-y')
    hold on
   %  ........
    legend('1','2,','3')
end

But i am still getting the legend on all plots.

any help is appreciated

Dan

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KSSV 2022-8-4

Refer this: https://in.mathworks.com/matlabcentral/answers/98474-is-there-a-command-in-matlab-for-creating-one-overall-legend-when-i-have-a-figure-with-subplots

danel james 2022-8-4

Unfortunatley this method is not working for me, dear KSSV

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回答（1 个）

Walter Roberson 2022-8-4

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1773600-legend-inside-for-loop#answer_1020880

在 MATLAB Online 中打开

for i=1:10
    figure()
    subplot(2,2,i)
    H(3*i-2) = plot(x, y, 'displayname', i + "A");
    hold on
    H(3*i-1) = plot(t, y, 'displayname', i + "B");
    subplot(2,2,i)
    H(3*i) = plot(x, y-y', 'displayname', i + "C");
    hold on
   %  ........
end
legend(H)

Are you wanting only 3 entries in the legend, total? If so then you would want to be explicit about the line colors, and you would legend(H(1:3))

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danel james 2022-8-4

I used your code to modify mine and its giving me this :

Error using legend (line 272)

Invalid argument. Type 'help legend' for more

information.

Error in single_legend (line 122)

legend(H)

Walter Roberson 2022-8-4

在 MATLAB Online 中打开

x = 1:10; y = rand(size(x));

for i=1:10

subplot(2,5,i)

H(3*i-2) = plot(x, y, 'displayname', i + "A");

hold on

H(3*i-1) = plot(x, y, 'displayname', i + "B");

H(3*i) = plot(x, y-y', 'displayname', i + "C");

hold off

% ........

end

Unable to perform assignment because the left and right sides have a different number of elements.

legend(H)

What size is y? If y is a vector then y - y' creates a square matrix in which each element of y is subtracted from each other element of y; the result of plotting that would be multiple lines.

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