Legend not using correct colors

Question

Nazmus Saadat 2020-1-5

1
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498972-legend-not-using-correct-colors

评论： Nazmus Saadat 2020-1-6

task3.mat

I seem to not be able to get legend to work properly. I have 3 plots, 2 of which I have specified colors for. But when attempting to create a legend for all 3, the colors I specified (red and green) both appear red. I have included the code used to create the figure, the figure itself and a MAT file containing the variables used to make the plot.

%%
figure
hold on
plot(k,avg_lowerbound)
plot(k,zeros(max_k)+avg_ibp_lowerbound,'r')
plot(k,zeros(max_k)+avg_lbp_lowerbound,'g')
legend("Random inputs", "I.B.P", "L.B.P")
xlabel('k') 
ylabel('Average lower bound')
%%

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Answer 1

Thiago Henrique Gomes Lobato 2020-1-5

6
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/498972-legend-not-using-correct-colors#answer_408729

在 MATLAB Online 中打开

Your zeros(max_k) was a matrix, so each plot command made many plots and the legends went to the wrong place. Making it only a vector solves your problem

figure
hold on
plot(k,avg_lowerbound)
plot(k,zeros(max_k,1)+avg_ibp_lowerbound,'r')
plot(k,zeros(max_k,1)+avg_lbp_lowerbound,'g')
legend("Random inputs", "I.B.P", "L.B.P")
xlabel('k') 
ylabel('Average lower bound')