How can I include the legends within the for loop and how can I set the xticks in MATLAB?

I have below the following data

Q = [16,32,64,128,256,512,1024];
VEC_5 = [0.2380    0.2380    0.2380    0.2380    0.2380    0.2380    0.2380];    
VEC_10 = [1.1898    1.1898    0.2380    0.2380    0.2380    0.2380    0.2380];   
VEC_15 = [2.1416    2.1416    2.1416    1.1898    1.1898    0.2380    0.2380];   
VEC_20 = [4.9970    3.0934    2.1416    2.1416    2.1416    1.1898    1.1898];   
VEC_25 = [4.9970    4.9970    4.9970    3.0934    2.1416    2.1416    1.1898];  
VEC_30 = [8.8043    5.9488    4.9970    4.9970    3.0934    2.1416    1.1898];   
VEC_35 = [10.7079    8.8043    6.9007    4.9970    4.9970    2.1416    2.1416];  
VEC_40 = [14.5152   10.7079    8.8043    6.9007    4.9970    3.0934    2.1416];   
VEC_45 = [16.4188   11.6597   10.7079    8.8043    4.9970    4.9970    2.1416];   
VEC_50 = [19.2742   14.5152   10.7079    8.8043    5.9488    4.9970    2.1416];   
VEC_55 = [21.1779   16.4188   13.5634   10.7079    6.9007    4.9970    2.1416];   
VEC_60 = [23.5574   16.4188   14.5152   10.7079    8.8043    4.9970    2.6175]; 

I drew them with semilogx function in Matlab as shown below:

as demonstrated in the code below:

VEC = [VEC_5;VEC_10;VEC_15;VEC_20;VEC_25;VEC_30;VEC_35;VEC_40;VEC_45;VEC_50;VEC_55;VEC_60];
figure
cmap = jet(12);
hold on
for k = 1:12
  semilogx(Q,VEC(k,:), 'Color', cmap(k, :),'LineWidth',2,'MarkerEdgeColor','b');
end
hold off
xticks(Q)
xlabel('Q order');
ylabel('Coverage area');
legend('\theta_1_/_2 = 5','\theta_1_/_2 = 10','\theta_1_/_2 = 15','\theta_1_/_2 = 20','\theta_1_/_2 = 25','\theta_1_/_2 = 30','\theta_1_/_2 = 35','\theta_1_/_2 = 40','\theta_1_/_2 = 45','\theta_1_/_2 = 50','\theta_1_/_2 = 55','\theta_1_/_2 = 60')
grid on;

So, how can I include legends with the for loop instead of writing it outside? and the values in the x-axis are too close to each other how can I separate them to something like below? and how can I add markers on the lines?

Answer 1

[Matt J]

So, how can I include legends with the for loop instead of writing it outside?

You are assuming here that the for loop is the only way to automatically generate the legend strings. Not so:

Q = [16,32,64,128,256,512,1024];
VEC_5 = [0.2380    0.2380    0.2380    0.2380    0.2380    0.2380    0.2380];    
VEC_10 = [1.1898    1.1898    0.2380    0.2380    0.2380    0.2380    0.2380];   
VEC_15 = [2.1416    2.1416    2.1416    1.1898    1.1898    0.2380    0.2380];   
VEC_20 = [4.9970    3.0934    2.1416    2.1416    2.1416    1.1898    1.1898];   
VEC_25 = [4.9970    4.9970    4.9970    3.0934    2.1416    2.1416    1.1898];  
VEC_30 = [8.8043    5.9488    4.9970    4.9970    3.0934    2.1416    1.1898];   
VEC_35 = [10.7079    8.8043    6.9007    4.9970    4.9970    2.1416    2.1416];  
VEC_40 = [14.5152   10.7079    8.8043    6.9007    4.9970    3.0934    2.1416];   
VEC_45 = [16.4188   11.6597   10.7079    8.8043    4.9970    4.9970    2.1416];   
VEC_50 = [19.2742   14.5152   10.7079    8.8043    5.9488    4.9970    2.1416];   
VEC_55 = [21.1779   16.4188   13.5634   10.7079    6.9007    4.9970    2.1416];   
VEC_60 = [23.5574   16.4188   14.5152   10.7079    8.8043    4.9970    2.6175]; 

VEC = [VEC_5;VEC_10;VEC_15;VEC_20;VEC_25;VEC_30;VEC_35;VEC_40;VEC_45;VEC_50;VEC_55;VEC_60];
figure
cmap = jet(12);
hold on
for k = 1:12
  plot(log2(Q),VEC(k,:), 'Color', cmap(k, :),'LineWidth',2,'MarkerEdgeColor','b');
end
hold off
xticks(log2(Q))
xticklabels(string(Q))
xlabel('Q order');
ylabel('Coverage area');

legstr="\theta_1_/_2 ="+(5:5:60);
legend(legstr)
grid on;

[Haitham AL Satai]

@Matt J Thank you very dear sir. Is possible to add markers on the curves?

[Matt J]

Of course!

[Haitham AL Satai]

@Matt J Could you assist me with it, please?

[Matt J]

For example,

plot(log2(Q),VEC(k,:), 'Color', cmap(k, :),'LineWidth',2,'Marker','d');

[Haitham AL Satai]

@Matt J Thanks a lot sir.