Legend line are the same always

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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')
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 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'};
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
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
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 on 9 Oct 2013
does not work the color of legend lines are the same

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