Legend line are the same always

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Niki
Niki 2013-10-9
评论： Sean de Wolski 2013-10-10
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')
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Niki
Niki 2013-10-10
Now it should run, but I still could not solve the problem
Sean de Wolski
Sean de Wolski 2013-10-10
Did you try the code I posted below that does exactly what you want?

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回答（2 个）

sixwwwwww
sixwwwwww 2013-10-9
编辑：sixwwwwww 2013-10-9
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
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Niki
Niki 2013-10-9
does not work , it is already mentioned and it is good when you want to plot a vector, but I am plotting matrix and I have three or more
Niki
Niki 2013-10-9
I just added an example of three plots above

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Sean de Wolski
Sean de Wolski 2013-10-9
编辑：Sean de Wolski 2013-10-9
Pass the plot handles into legend
More
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

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