How can I plot a diagram with 12-15 different colors

I am plotting this graph and each graph has a different argument (y value) to it, now i want to give all the graphs different colours , how can i do that , if anyone knows please help. (Figure 2 of the Code)

clc; 
clear all;
t=2.5; %ineV
a=1.42e-10; %inAngstrom
h1=1e-3;
ka=-3.14:h1:3.14;
%defineing the self interaction within the unitcell
H0=zeros(12,12);
H0(1,2)=t;
H0(2,1)=t;
H0(2,3)=t;
H0(2,5)=t;
H0(3,2)=t;
H0(3,5)=t;
H0(3,8)=t;
H0(4,3)=t;
H0(5,2)=t;
H0(5,6)=t;
H0(6,5)=t;
H0(6,7)=t;
H0(6,9)=t;
H0(7,6)=t;
H0(7,8)=t;
H0(8,3)=t;
H0(8,7)=t;
H0(9,6)=t;
H0(9,10)=t;
H0(10,9)=t;
H0(10,11)=t;
H0(11,10)=t;
H0(11,12)=t;
H0(12,7)=t;
H0(12,11)=t;
%definingH1At a (RHS)of H0 
H1=zeros(12,12);
H1(4,1)=t;
H1(8,5)=t;
H1(12,9)=t;
%defineing H2 at-a (LHS)of H0
H2=transpose(H1);
ep=exp(i*ka);
for j=1:length(ka)
    %j
    %ka(1,j)
    if ka(1,j)==0
        zeroKaindex=j
    end

    h=H0+H1.*exp(i*ka(1,j))+H2.*exp(-i*ka(1,j));
    E=abs(eig(h)); %12x1 collum matrix
    E1(1,j)=E(1,1); %taking only the 1st eigen value outof 12 
    E2(1,j)=E(2,1);%taking only the 2nd eigen value outof 12
    E3(1,j)=E(3,1);%taking only the 3rd eigen value outof 12
    E4(1,j)=E(4,1);%taking only the 4th eigen value outof 12
    E5(1,j)=E(5,1);%taking only the 5th eigen value outof 12
    E6(1,j)=E(6,1);%..so on 
    E7(1,j)=E(7,1);
    E8(1,j)=E(8,1);
    E9(1,j)=E(9,1);
    E10(1,j)=E(10,1);
    E11(1,j)=E(11,1);
    E12(1,j)=E(12,1);

   
    
end

zeroKaindex = 3141

%% Plot of Band diagram

figure(1)
hold on
grid on;title("Energy values at Ka=0");
yline(E1(1,zeroKaindex),'r','E1')
yline(E2(1,zeroKaindex),'g','E2')
yline(E3(1,zeroKaindex),'b','E3')
yline(E4(1,zeroKaindex),'k','E4')
yline(E5(1,zeroKaindex),'--r','E5')
yline(E6(1,zeroKaindex),'--g','E6')
yline(E7(1,zeroKaindex),'b--','E7')
yline(E8(1,zeroKaindex),'-.g','E8')
yline(E9(1,zeroKaindex),'.c','E9')

Warning: Marker input is ignored.

yline(E10(1,zeroKaindex),'--c','E10')
yline(E11(1,zeroKaindex),'-.k','E11')
yline(E12(1,zeroKaindex),'-.g','E12')
bandgap_in_eV=E1(1,zeroKaindex)-E3(1,zeroKaindex)

bandgap_in_eV = 0.6262

axes = gca;
axes.LineWidth=0.75; axes.FontSize=15; axes.FontWeight='bold';axes.Box='on';
lines = axes.Children;
set(lines,'LineWidth', 2);

%%this is where i need help
figure(2)
hold on; grid on;title("BAND diagram");
plot(ka,E1, 'r--','LineWidth',0.8);
plot(ka,E2, '-.k','LineWidth',0.8);
plot(ka,E3, '-.g','LineWidth',0.8);
plot(ka,E4, '-.b','LineWidth',0.8);
plot(ka,E5, '-k','LineWidth',0.8);
plot(ka,E6, 'g--','LineWidth',0.8);
plot(ka,E7, '-r','LineWidth',0.8);
plot(ka,E8, '-g','LineWidth',0.8);
plot(ka,E9, '-b','LineWidth',0.8);
plot(ka,E10, '-c','LineWidth',0.8);
plot(ka,E11, '-m','LineWidth',0.8);
plot(ka,E12, 'y--','LineWidth',0.8);
xlabel('ka');
ylabel('energy E in eV');
axes = gca;
axes.LineWidth=0.75; axes.FontSize=15; axes.FontWeight='bold';axes.Box='on';
lines = axes.Children;
set(lines,'LineWidth', 2);

[Stephen23]

"now i want to give all the graphs different colours , how can i do that"

You would need to generate 15 different colors, e.g.:

https://www.mathworks.com/matlabcentral/fileexchange/70215-maximally-distinct-color-generator

[Subham Mahanti]

Okay , but how to do that in this context , i mean how to incorporate that into my plot , if there is any alternate easier way then also suggest

Answer 1

[Alan Stevens]

Specify the colors with RGB triplets.

doc Color

[Subham Mahanti]

can you explain a liitle more or refer a link , i have exhausted the already mentioned RGB colours

[Steven Lord]

When specifying a color for a plot you can choose one of the eight options that have color names or short names associated with them ('r' for red, for example) or you can specify an RGB triplet if you want the line to be in a color that's not one of the eight.

x = 1:10;
y = x.^2;
plot(x, y, 'r', 'DisplayName', 'red line')
hold on
plot(flip(x), y, 'Color', [0.75, 0.25, 0.5], 'DisplayName', 'purple-ish')
legend show

I can't show it on Answers (since it's an interactive tool) but if you need help choosing a good color for your plots use the uisetcolor function to interactively select a color from the color picker and get its RGB triplet.

[Alan Stevens]

Here are 15 for example:

RGB = [0, 0, 0;
0, 0, 1;
0, 1, 0;
1, 0, 0;
0, 1, 1;
1, 0 1;
1, 1, 0;
1, 0.1, 0.1;
0.8, 0.8, 0.8;
0.9, 0.5, 0.1;
0.1, 0.5, 0.9;
0.2, 0.1, 0.6;
0.7, 0.9, 0.3;
0.3, 0.5, 0.7;
0.4, 0.1, 0.9];

x = [0, 1];
figure
hold on
for i = 1:15
    y = x+i;
    plot(x,y,'Color',RGB(i,:))
end

[Subham Mahanti]

Thank you so much , where did you find the RGB values of any colour ?

[Alan Stevens]

I simply made them up! You can make up your own.

[Steven Lord]

Use uisetcolor. For example I brought up that dialog (using the code I commented out below, since it won't work on MATLAB Answers) and selected a dark-ish pink. It returned a certain vector that I've approximated below.

% c = uisetcolor;
c = [0.9686, 0.5137, 0.7333];
surf(peaks, 'FaceColor', c)

[Subham Mahanti]

Yes got it Thank you everyone !