# How to mark different values with different colors and markers

39 views (last 30 days)
Learner on 11 May 2014
Hi,
I have a complex data values:
Z = X+iY =
0.1 0.2
-75.7 1.1
-1.0 4.1
-2.0 4.3
-1.7 5.6
-0.9 7.3
0.0 7.3
0.7 5.1
1.2 0.0
-1.3 9.0
-0.9 5.1
0.0 0.2
0.0 0.0
The first column is values of X axis (real) and second column value is Y axis (imaginary)
What I want to do is: Plot all 13 points with different color and marker and marksize.
-----------------------------
I tried this approach:
plot(Z(1,:),'g+','MarkerSize',10, Z(2,:),'c^','MarkerSize',8, .....)
-----------------------------
^^ But this approach is not working!!
Please help me out.
Thanks in advance.
##### 1 CommentShowHide None
Ali on 29 Oct 2017
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
--------------------------------------- picture link preview

Sign in to comment.

### Accepted Answer

dpb on 11 May 2014
plot creates a line object and the above are all global properties of the line.
To put them on as differently you'd have to place each point with scatter which is what it seems you're looking for, anyway.
doc scatter
for more details; reply herein if that doesn't solve the problem.
##### 2 CommentsShowHide 1 older comment
Image Analyst on 11 May 2014
That's because all your markers are 'r', which is red, not the different colors like you want. Pass in an N by 3 array instead, like jet(size(Z_real, 1)).

Sign in to comment.

### More Answers (2)

dpb on 11 May 2014
Basics are as follows--
fmt=['%.2f + %.2fi']; % build a format string for complex
scatter(Z(:,1),Z(:,2)) % plot the points
text(Z(:,1),Z(:,2),num2str(Z,fmt)) % label them per the formatting
Salt to suit; your values overlap enough may need to do some selective placement or orientation to be able to read 'em all.
##### 0 CommentsShowHide -1 older comments

Sign in to comment.

%https://zil.ink/korosh -------- Ways to contact me ----------
% Korosh Agha Mohammad Ghasemi !
% Chemical Engineering at Shiraz University
x=linspace(0,2,100);
figure;
for a=[0.1 0.5 1 2 4]
y=x.^a; %The function is hypothetical
if a == 0.1 %Any color can be substituted
y=x.^a;
plot(x,y,'k') %Now choose the color
hold on
elseif a == 0.5
y=x.^a;
plot(x,y,'b') %Now choose the color
hold on
elseif a==1
y=x.^a;
plot(x,y,'g') %Now choose the color
hold on
elseif a==2
y=x.^a;
plot(x,y,'r') %Now choose the color
hold on
elseif a==4
y=x.^a;
plot(x,y,'y') %Now choose the color
hold on
grid on
end
end
##### 0 CommentsShowHide -1 older comments

Sign in to comment.

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by