Legend does not match plot

Question

André 2016-6-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/291604-legend-does-not-match-plot

评论： Walter Roberson 2016-6-22

I used the following code to generate my plot (and I want it later to include in my LateX document):

clear all; close all; clc;
a1 = 1; a2 = 1; c1 = 2.0; c2 = 1.8; time = 0:0.1:300;
wave1 = a1 * sin(c1*time); 
wave2 = a2 * sin(c2*time); 
wave3 = wave1 + wave2; 
y = hilbert(wave3);
env = abs(y);
bound = 0.1*cos(0.2*time-pi);
plot(time,wave3,'k',time,[-1;1]*env,'--k',time,bound,'-.r', 'Linewidth',1.2);
ylabel(' $\eta$ (m)');
xlabel(' Time (s)'); 
legend = legend({'Short waves','Wave group envelope','Bound long wave'});
set(legend, 'FontSize',20);
axis([15.7 110 -2.5 2.5]);
set(groot, 'defaultAxesTickLabelInterpreter','latex'); set(groot,     'defaultLegendInterpreter','latex');

The graph looks like:

Clearly, the 'bound long wave' legend does not match the color and line specification in the graph. As far as I know, it has something to do with scalar/vector but I cannot figure out where the error is.

How to proceed further?

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Answer 1

Walter Roberson 2016-6-22

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/291604-legend-does-not-match-plot#answer_226328

在 MATLAB Online 中打开

Inside the plot, time,[-1;1]*env generates two lines, for a total of 4 overall. But you only legend() for three lines. The fix is:

h = plot(time, wave3, 'k', time, [-1;1]*env, '--k', time, bound, '-.r', 'Linewidth', 1.2);
Lh = legend(h([1, 2, 4]), {'Short waves','Wave group envelope','Bound long wave'});
set(Lh, 'FontSize',20);