Dynamic Legends plot option (error: two legend lines for each plot)

I have a function which makes a plot from different vectors, then each time that I add a new plot I need to add a new legend which is a variable(legend) now I trying to do it with the next code:

plot_test = plot(vector1, vector2, '-mo','Color',color, 'DisplayName',legend);
hold all;
legend('-DynamicLegend');

but as result I got two new legends for each plot, one whith the real name and another called line2, line4, line6....and so on depending the number of plots...

Any help please?

Answer 1

[Azzi Abdelmalek]

Look at this example

x=0:0.1:10;
y1=sin(x);
plot(x,y1)
hl=legend('leg1')
hold all
y2=cos(x)
plot(x,y2)
leg=[get(hl,'string'), 'leg2']
hl=legend(leg)

[Manuel]

Thanks Azzi this works, but in my case this will go inside a function which will be executed for each plot, then ' hl=legend('leg1') ' should be executed only the first time that the function is executed. I tried with a condition but since goes inside the function is no possible. Any idea?

Thanks again,

[Azzi Abdelmalek]

Add to your input and output argument of your function the handles old_hl and hl

[Manuel]

This is the function now:

function [plot_test, hl, old_hl] = plot_vector(Test, cond1, cond2, cond3, color, test1, hl, old_hl)

plot_test = plot(cell2mat(plot_array.vector1),cell2mat( plot_array.vector2),'-mo','Color',color);

old_hl=legend(strcat(cond1,'°C ',cond2,'mV ',cond3,'Overshoot'));
leg=[old_hl(hl,'string'), strcat(cond1,'C ',cond2,'mV ',cond3,'Overshoot')];
hl=legend(leg);
hold all

I have the same behavior, I don't understund from where is coming old_hl, there is no variable call like that...

I really appreciatte your help Azzi, Thanks again!

Answer 2

[Robert Cumming]

Is this the type of feature your after:

figure;
x = [0:0.01:2*pi];
hold on;
plot ( x, sin (x), 'DisplayName', 'Plot A' )
legend ( '-dynamicLegend' )
plot ( x,- sin (x), 'r', 'DisplayName', 'Plot B' )
plot ( x, 2*sin (x), 'g', 'DisplayName', 'Plot C' )

[Manuel]

I dont understund what you mean. I was using this option but it creates two legend fields(one as'Plot A' and one as 'line2') for each plot.