Plotting with different colored markers

Hi All,

As you know, the plot command gives each line a different color so that the user can distinguish between the each dataset. When you have two lines, you have 2 colors...6 lines, 6 colors etc. Very convenient.

How can I do this but for markers instead? The number of datasets I want to plot is different each time...I might have 2,3,4,5 up to x datasets. Is there a way to represent each set using a different marker (when the number of sets is variable)?

[Ali]

if true
--------------------------------------------------- code start
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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Answer 1

[Image Analyst]

You can use scatter() and give each marker its own color if you want. You can put them on top of a line/curve plot if you want if you call "hold on" in between calls to plot() and scatter().

[myetceteramail myetceteramail]

how to give each marker different colour using scatter

[Image Analyst]

One of the inputs to scatter is a list of colors for each marker.

Answer 2

[Matt Fig]

You can set the linestyleorder.

clf
set(gca,'linestyleorder',{'-',':','-.','--'},...
    'colororder',[0 0 1;0 .5 0;1 0 0],...
    'nextplot','add')
x = 0:.01:1;
plot(x,bsxfun(@power,x.',1:12))

Answer 3

[Nilesh Salvi]

Express the color to be assigned in plot function as RGB-Value rather than 'Short name'. To get a new color generated for every time plot function is called I assign random RGB value to the color spec. http://goo.gl/hq6q4

for i = 1:N
    plot(x,y(i),[rand rand rand]);
end

that should plot N number of 'y' curves of N random shades.

[Rainer]

Good idea too.