# How to add a verteical pad obove and below the curve and graph style and color displays?

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Nisar Ahmed on 1 Jun 2022
Answered: Mathieu NOE on 3 Jun 2022
Hello,
I have two questions and the data is attached to the question:
Q1) Lest hand side code is for the figure on right hand side. How I can the color of each curve and curve style (dotted, asterisk, etc.) by myself in the code instead of MATLAB is chossing automatically?
Q2) In the figure on right hand side, qp at various f are plotted against VD. I have attached a data having VD and one of qp curve. the qp curves not of same length of VD. I want to add a pad above and below the qp curves such that it becomes equal to VD. The pad values should be between 0.001 to 0.002. How I can do it? Nisar Ahmed on 1 Jun 2022
Here is the data in which qp or Inv Q is a 2D matrix.

Hiro Yoshino on 1 Jun 2022
Solution 1:
You can control the order of color by using colororder.
Also, you can specify the line markers by like this.
Solution 2:
How about re-sampling the VD with interp1 so you can have the identical length for that vector?
Nisar Ahmed on 1 Jun 2022
In the figure code, it is loop here so how to specify the colororder or markers is not working
figure(1),
hold on
for kk = 1:10:600
plot(Inv_Q(:,kk),VD, 'DisplayName',sprintf('f = %d',f(kk)))
end
hold off
grid
legend('Location','best'); set(gca, 'ydir', 'reverse');
xlim([0 3.0e-2]); ylim([1.8879e+03 2.1313e+03]);
xlabel('qp'); ylabel('VD');
2) I do not need to interploate, istead I need to add pad above and below until both matrices become equal.

Mathieu NOE on 3 Jun 2022
hello Nisar
this is my suggestion , and result
your last mat file does not contain the f data so I skipped that portion of code for the time being - should be fairly easy to reactivate it on your side
here a demo with a spacing of 5 netween succesive data (your original code was with a spacing of 10) clc
[m,n] = size(Inv_Q);
%% define your custom color order
% option 1 : manually : possible but takes time and not flexible / robust
% colors = [0 0 1;...
% 0 1 0;...
% 1 0 0;...
% 0 1 1;...
% 1 0 1;...
% 1 0.69 0.39;...
% 0.6 0.2 0;...
% 0 0.75 0.75;...
% 0.22 0.44 0.34;...
% 0.32 0.19 0.19]; %10x3 RGB array
% % or based on existing color maps
% colors = jet(n);
% or this
% % https://fr.mathworks.com/matlabcentral/fileexchange/42673-beautiful-and-distinguishable-line-colors-colormap
% colors = linspecer(60);
% even better :
func = @(x) colorspace('RGB->Lab',x); % https://fr.mathworks.com/matlabcentral/fileexchange/28790-colorspace-transformations
colors = distinguishable_colors(n,{'w','k'},func); % https://fr.mathworks.com/matlabcentral/fileexchange/29702-generate-maximally-perceptually-distinct-colors
%% define line styles and loop over them
linS = {'-','--',':','-.'};
figure(1),
hold on
c = 0;
cc = c;
new_x = linspace(min(VD1),max(VD1),m);
for kk = 1:5:n
c= c+1;
cc = cc+1;
if cc>length(linS)
cc = 1 ; % restart from 1
end
plot(Inv_Q(:,kk),new_x,'Color',colors(c,:),'linestyle',linS{cc}); % plot(Inv_Q(:,kk),VD1, 'DisplayName',sprintf('f = %d',f(kk)))
leg_str{c} = (['Data ' num2str(kk)]);
end
hold off
grid
legend(leg_str,'Location','best'); set(gca, 'ydir', 'reverse');
xlim([0 3.0e-2]); ylim([1.8879e+03 2.1313e+03]);
xlabel('qp'); ylabel('VD');