Legend not using correct colors

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')
%%

Answer 1

[Thiago Henrique Gomes Lobato]

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')

[Nazmus Saadat]

Ah thanks! I can't believe I didn't spot that.