Legend line are the same always

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]

This doesn't even run. See More in my answer below.

[Niki]

Now it should run, but I still could not solve the problem

[Sean de Wolski]

Did you try the code I posted below that does exactly what you want?

Answer 1

[sixwwwwww]

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

[Niki]

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]

I just added an example of three plots above

Answer 2

[Sean de Wolski]

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

[Niki]

does not work the color of legend lines are the same