Coloring of different index/numbered points

Hi all,

I have several points say 100 points. Each points have unique index/number from 1 to 100. I want to see 1 to 20 index point as blue color, 21-40 index point is red, 41-60 is green,61-80 is yellow ,and 81-100 is purple. How can I do this? Thanks in advance.

Answer 1

[Image Analyst]

try this:

markerSize = 50;
x = rand(100, 1);
y = rand(100, 1);
plot(x(1:20), y(1:20), 'b.', 'MarkerSize', markerSize);
hold on;
plot(x(21:40), y(21:40), 'r.', 'MarkerSize', markerSize);
plot(x(41:60), y(41:60), 'g.', 'MarkerSize', markerSize);
plot(x(61:80), y(61:80), 'y.', 'MarkerSize', markerSize);
purple = [0.6, 0, 0.6];
plot(x(81:100), y(81:100), '.', 'Color', purple, 'MarkerSize', markerSize);
grid on;

[Rubel Ahmed]

Thanks@Image Analyst

Answer 2

[Peter Bonavita]

You can use hold on to plot multiple sets of points on the same figure, and customize the plot of each set.

Here's an example. Check out the linespec section of the plot documentation for more info about changing the color!

x = rand(100,1);
figure; hold on; % hold on lets me plot multiple sets of points on same figure
plot((1:20),x(1:20),'bo'); %blue, circle
plot((21:40),x(21:40),'ro'); %red circle
plot((41:60),x(41:60),'go') %green circle
plot((61:80),x(61:80),'yo') %yellow circle
plot((81:100),x(81:100),'mo'); %magenta circle

[Rubel Ahmed]

Thanks!!!@Peter Bonavita