Labelling mulitple traces on plot

Hi,

How would you go about automatically labeling each trace on a plot for the case where the values are automatically generated in a for loop

from this

to this

The labels either sitting on top of each trace or adjacent outside the plot preferably with transparent background.

my code:

for nn = 1:Kappan
    cc = jet(Kappan);
    figure(1)
    loglog(dratio,G(nn,:),'.-','color',cc(nn,:))
    grid on
    xlabel('Length / Diameter')
    ylabel('Gain')
    legend('boxoff'),legend(c,'location','NorthWest')
    hold on
end
hold off

Thank You,

Joe

[Walter Roberson]

What is your "c" variable that you are passing as the first argument to legend() ?

[Joseph]

Hi Thanks for the replies. c variable is to color each trace code below

c={}; for i=1:length(Kappa) c{end+1}=num2str(Kappa(i)); end

for nn = 1:Kappan cc = jet(Kappan); figure(1) loglog(dratio,G(nn,:),'.-','color',cc(nn,:)) grid on xlabel('Length / Diameter') ylabel('Gain') legend('boxoff'),legend(c,'location','NorthWest') hold on end hold off

% set(gcf, 'PaperPositionMode', 'auto'); saveas(gcf, 'test2', 'pdf') %Save figure export_fig('C:\Users\Joseph\Documents\Geophysics\PhD\Matlab', '-pdf','-painters');

[Walter Roberson]

I adjusted my code accordingly.

Answer 1

[Walter Roberson]

figure(1)

for nn = 1:Kappan
  loglog(dratio, G(nn,:), 'kd', 'LineStyle', 'none');
  if nn == 1
    grid on
    xlabel('Length / Diameter')
    ylabel('Gain')
    hold on
  end
  text(dratio(end), G(nn,end), str2num(Kappa(nn)), 'HitTest', 'off', 'HorizontalAlignment', 'center', 'VerticalAlignment', 'bottom')
end
hold off

We need more information in order to generate the "wait" line and the infinity trace.

[Joseph]

Much appreciated.

[Walter Roberson]

The code I gave above should do to replace everything from "c={};" downward.

However, the sample figure you desire has a solid "wait" line shown, and to plot that we will need an equation, and we need to know which dratio values to plot it at. In the diagram you showed, the last 6 markers were not included in the "wait" line, except for the 200 and infinity case which excludes fewer markers (unless there is simply a "ylim" in effect that cuts some of them out of the figure.)

[Joseph]

Sorry If I haven't mentioned this before I am just using equation (29)and ignoring the wait trace. If I put in xlim and ylim the text labels for Kappa dissapear. Therefore I would like to resize my plot to fit nicely for different Kappa values. How do you plot if a value Kappa is infinity?

[Walter Roberson]

Where I used dratio(end), G(nn,end) you could substitute something like dratio(end-6), G(nn,end-6) to move the label further left along.

If you were to add infinity to the Kappa list, then "infinity" or perhaps "inf" would be used as the label. When you had the equation up, I had the impression you would be likely to get NaN for the outputs when the kappa was infinity, though (I did not try it myself.)

[Joseph]

Yes, that's correct. Nan for the output of Gain if Kappa = Inf. So I guess I'll put an arbitrary large number for example 10^10 as Inf. And then how would you replace 10^10 on the text label with Inf?

[Walter Roberson]

 if nn == Kappan
   Kstr = 'inf';
 else
   Kstr = str2num(Kappa(nn));
 end
 text(dratio(end), G(nn,end), Kstr, 'HitTest', 'off', 'HorizontalAlignment', 'center', 'VerticalAlignment', 'bottom')