gscatter - how to colour different marker styles according to a different variable?

Hi,

I'm fresh to matlab (1 day) so be kind! I aiming to include 4 variables on a scatter plot. So far.....

The variables for X and Y each consist of random numbers (each 90x1 double) The marker style was set according to a 3rd (aka A) variable (also 90x1 double) whose value ranges from 1 to 3, essentially generating 3 series of data on the plot.

Using gscatter(X,Y,A,[],'ox+') I've generated the following plot which successfully plots different markers according to variable A. The problem is I'd like to use a 4th variable (B) to determine the color of each marker set. The variable B would again be (90x1 double) whose values might be incremental 1,2,3,4, etc.... or random. Can this be done and can you explain it in a way that takes pity on someone who has never used matlab or code before. I've heard it might be done with hold functions but I've no idea how to incorporate these.

[Brian Hunt]

While this is old, I think it still deserves another answer for fixed number of types. If you want to group by two different things, one way to do so using gscatter in a loop as the following:

Suppose you have a group which you call A with 3 types and 3 colors. Suppose you also have a group called B with 5 types - 5 symbols.

%Create Vectors of 3 colors
clrs = ['rbk']

%Create Vector of markers with repeats length(A) 
and indices how many different B you have.
syms = ['ooo','+++','ddd','xxx','sss']

for i=1:3 %Loop over colors
   I = B == i
   x = All_X(I)
   y = All_Y(I)

for j=1:4

grp = A(I); %Anything that separates the A further

gscatter(x,y,grp,clrs,syms(j))
if(i==1 & j==1)
hold on
end
end
end

hold off

Warning: I didn't test this exact code for typos but have used this idea so the principle works.

[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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