How do I add markers when using plotyy?

I'm plotting two curves using 2 different y-axes using plotyy. I would like to add markers to the data, and I can't figure out how to do that. The 'LineStyle' property will allow me to change from solid to dashed, etc; but won't let me change anything else.

Answer 1

[Michelle Hirsch]

Easy Answer: If you are using R2016a or newer, use yyaxis instead of plotyy. yyaxis lets you use any plotting command, e.g.

yyaxis left
plot(x,y,'-*')  % Plot into left axes
yyaxis right
plot(x,z,'-o') % Plot into right axes

If you are on an older release, there's an example in the doc for plotyy called changing linestyles that gets you close. The difference is that instead of setting values for the LineStyle property, you set values for the Marker property

x = 0:0.01:20;
y1 = 200*exp(-0.05*x).*sin(x);
y2 = 0.8*exp(-0.5*x).*sin(10*x);

[hAx,hLine1,hLine2] = plotyy(x,y1,x,y2);
hLine1.Marker = 'o';
hLine2.Marker = '*';

If you aren't familiar with graphics objects like hLine1, a few tips:

• Display it at the command line to see some of the common properties you can control
• In the command window, hit the TAB key after typing "hLine1." to see a list of all properties.
• Learn more here: Using Graphics Objects

[Maurice]

Tried it. Didn't work.

[Jan]

@Maurice: Please explain what did not work. Do you get an error message or does the result differ from your expectations? Explaining this would help Michelle to adjust her suggestion. Without knowing your code and the problem, suggesting anything else would be based on pure guessing.

[Michelle Hirsch]

+1 Jan. What version are you using? If older than 14b, change last 2 lines to:

set(hLine1,'Marker','o')
set(hLine2,'Marker','*')

[Maurice]

Thank You Michelle! Your last suggestion did the trick!

[Ali]

if true
--------------------------------------------------- code start
This is an example for your case 
Input is "Input_Data", two dimension matrix 
Marker_Counter=1;
   figure6=figure;
   Markers = {'+','o','*','x','v','d','^','s','>','<'};
   for i=1:10:size(Input_Data,1)
    TPR=Input_Data(i:i+9,7);
    FPR=Input_Data(i:i+9,8);
plot(FPR,TPR,strcat('-',Markers{Marker_Counter}));
Marker_Counter=Marker_Counter+1;   
hold on
   end
plot([0.5 1],[0.5 1],'--');
legend('Minpts = 100','Minpts = 200','Minpts = 300','Minpts = 400','Minpts = 500','Minpts = 600','Minpts = 700','Minpts = 800','Minpts = 900','Minpts = 1000','','Location','SouthEast');
xlabel('FPR or (1-Specificity)','FontSize',12,'FontWeight','bold'); ylabel('TPR or Spensitivity)','FontSize',12,'FontWeight','bold');
title('ROC Space');
close(gcf);
-------------------------------------------- code end
end
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