Does anybody know how to include a legend in a figure of three functions with different colours or patterns?

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student 2015-2-18

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编辑： student 2015-2-18

Hi, I am plotting three functions at the same time in order to compare them and I would like to include a legend in this graphic, to represent the color and correspondet name of each function. Does anybody know how to do it?

plot(t,x1,'r'); hold on; plot(t,x2,b--o'); hold on plot(t,x3,g--');

Thank you!!!

title('Comparison'); xlabel('Time'); ylabel('f(t)');

subplot(132); plot(t1,x_rec_vel(:,2),'r'); hold on; plot(t1,Y(1:end-1,5),'b--o'); title('Velocity Mass 2'); xlabel('Time'); ylabel('v(t)');

subplot(133); plot(t1,x_rec_vel(:,3),'r'); hold on; plot(t1,Y(1:end-1,6),'b--o'); title('Velocity Mass 3'); xlabel('Time'); ylabel('v(t)');

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Answer 1

emehmetcik 2015-2-18

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https://ww2.mathworks.cn/matlabcentral/answers/179099-does-anybody-know-how-to-include-a-legend-in-a-figure-of-three-functions-with-different-colours-or-p#answer_168449

在 MATLAB Online 中打开

    doc legend
plot(t,x1,'r'); 
hold on; % One 'hold on' is enough
plot(t,x2,b--o'); 
plot(t,x3,g--');
legend('Function-1', 'Function-2', 'Function-3')

... same for other figures as well.

You can use this form as well:

h1(1) = plot(t,x1,'r', 'displayName', 'Function-1'); 
hold on; % One 'hold on' is enough
h(2) = plot(t,x2,b--o', 'displayName', 'Function-1'); 
h(3) = plot(t,x3,g--', 'displayName', 'Function-1');
legend(h)