Legend does not refresh after hold command

Let'say I plot 2 lines and I want to display a legend

plot(1:10,'b','displayname','1st graph')
hold on
plot(3:5,'r','displayname','2ng graph')
legend('show')

It works as expected, I have a legend and 2 annotations.

Not let's say I also want to display the legend before the hold command (for any reason) :

plot(1:10,'b','displayname','1st graph')
legend('show')
hold on
plot(3:5,'r','displayname','2ng graph')
legend('show')

This time only the first annotation is displayed . I expected that recalling legend will refresh the legend information.

1. Is it the expected behavior?
2. What are the best practices to call legend ?
3. Do we have to call legend ONCE and only after having plotted everything?

Thanks for your tips,

Aurélien

Answer 1

[Aurelien Queffurust]

I have just noticed that there was no answer . Since this question I found 3 workarounds :

2 solutions on my blog

This is one :

plot(1:10,’b',’displayname’,’1st graph’)
legend(‘-DynamicLegend’);
legend(‘show’)
hold on
plot(3:5,’r',’displayname’,’2ng graph’)
legend(‘show’)

Another solution from Yair : here