How to hide or delete the legend that is not needed

FYI, please see the attached figure.

My aim is to hide or delete the legend data1, data2 and data3, to be like this figure.

Thanks!

[Cris LaPierre]

Share the code you use to create and format your figure.

[Terence]

for it=1
    plot(lv,reag(it,:),'color',[0 0.4470 0.7410],'LineWidth',LineWidth, 'DisplayName','Mode 1,Analytical,UD');
end
for it=2
    plot(lv,reag(it,:),'color',[0 0.4470 0.7410],'LineWidth',LineWidth);
end
for it=3
    plot(lv,reag(it,:),'color',[0.8500 0.3250 0.0980],'LineWidth',LineWidth,'DisplayName','Mode 2,Analytical,UD');
end
for it=4
    plot(lv,reag(it,:),'color',[0.8500 0.3250 0.0980],'LineWidth',LineWidth);
end
for it=5
    plot(lv,reag(it,:),'color',[0.9290 0.6940 0.1250],'LineWidth',LineWidth,'DisplayName','Mode 3,Analytical,UD');
end
for it=6
    plot(lv,reag(it,:),'color',[0.9290 0.6940 0.1250],'LineWidth',LineWidth');
end
lgd = legend;
lgd.NumColumns = 1;
legend('boxoff')

Answer 1

[Cris LaPierre]

Use line objects as inputs to legend, telling it which lines to include in the legend.

x=1:10;
y=@(x,a)((x-5)/a).^2;

p1 = plot(x,y(x,1),'DisplayName','Mode 1,Analytical,UD');
hold on
plot(x,y(x,1.1));
p2 = plot(x,y(x,2),'DisplayName','Mode 2,Analytical,UD');
plot(x,y(x,2.2));
p3 = plot(x,y(x,3),'DisplayName','Mode 3,Analytical,UD');
plot(x,y(x,3.3))
hold off
legend([p1,p2,p3])

[Terence]

It works now. Thanks!

Answer 2

[Image Analyst]

Try getting rid of the for loops, which essentially do nothing:

plot(lv,reag(1,:),'color',[0 0.4470 0.7410],'LineWidth',LineWidth, 'DisplayName','Mode 1,Analytical,UD');
hold on;
plot(lv,reag(2,:),'color',[0 0.4470 0.7410],'LineWidth',LineWidth);
plot(lv,reag(3,:),'color',[0.8500 0.3250 0.0980],'LineWidth',LineWidth,'DisplayName','Mode 2,Analytical,UD');
plot(lv,reag(4,:),'color',[0.8500 0.3250 0.0980],'LineWidth',LineWidth);
plot(lv,reag(5,:),'color',[0.9290 0.6940 0.1250],'LineWidth',LineWidth,'DisplayName','Mode 3,Analytical,UD');
plot(lv,reag(6,:),'color',[0.9290 0.6940 0.1250],'LineWidth',LineWidth');
legend({'1', '2', '3', '4', '5', '6'})