Legend line are the same always

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Niki
Niki on 9 Oct 2013
Commented: Sean de Wolski on 10 Oct 2013
I'm using hold on to draw different figures and after I have all the figures I use legend('lable1','lable2','lable3') however, all the legend are used with the same color, do you know how to use the exact color for each legend ?
I searched through different post and none of them could solve my problem
figure; hold on
plot ([1:10]',rand(10),'r')
plot ([1:10]',rand(10),'b')
plot ([1:10]',rand(10),'c')
  3 Comments
Sean de Wolski
Sean de Wolski on 10 Oct 2013
Did you try the code I posted below that does exactly what you want?

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Answers (2)

sixwwwwww
sixwwwwww on 9 Oct 2013
Edited: sixwwwwww on 9 Oct 2013
For matrices you can do like this
a = rand(10);
b = rand(20);
c = rand(30);
plot(a), hold on
plot(b), hold on
plot(c), hold on
legends = {'a', 'b', 'c'};
Legend=legend(legends);
set(Legend,'Interpreter','none');
In case of unknown number of matrices. you can use cell array to store legend text and then follow last two lines of code. I hope this will help
  2 Comments
Niki
Niki on 9 Oct 2013
I just added an example of three plots above

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Sean de Wolski
Sean de Wolski on 9 Oct 2013
Edited: Sean de Wolski on 9 Oct 2013
Pass the plot handles into legend
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When you plot rand(10) it will plot 10 lines and give you back 10 handles. Thus you'll need to only pass one of these into legend for each color:
figure; hold on
h = plot ([1:10]',rand(10),'r'); %10 line handles
h = vertcat(h,plot([1:10]',rand(10),'b'); %add second 10 line handles
h = vertcat(h,plot([1:10]',rand(10),'c')); %add third 10 line handles
legend(h(1:10:30),'One','Two','Three'); %pass every 10th line handle into legend
  1 Comment
Niki
Niki on 9 Oct 2013
does not work the color of legend lines are the same

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