How do I plot multiple ,different sized arrays on one scatter plot and get the legend to match with the specified colors?

I have 3 different data sets with varying xy array sizes (i.e. x1,y1,x2,y2,x3,y3) and I want to create a scatter plot with different symbols and colors on the same plot. I have managed to do this using the hold on command. The code is as follows:

figure
scatter(Shed_Rg,Shed,'b','o');
hold on
scatter(Uncertain_Rg,Uncertain,'k','.');
hold on
scatter(Attached_Rg,Attached,'g','x');

This works for plotting the points however when I create a legend, the colors of all the symbols in the legend are only produced in the last color I selected (in this case it would be green).

Answer 1

[Star Strider]

Create handles to each scatter call, and then use them as arguments to your legend call:

figure
h1 = scatter(Shed_Rg,Shed,'b','o');
hold on
h2 = scatter(Uncertain_Rg,Uncertain,'k','.');
hold on
h3 = scatter(Attached_Rg,Attached,'g','x');
legend([h1,h2,h3], 'Shed', 'Uncertain', 'Attached')

The legend entries should be appropriate for each set.

[Randall Berdon]

Hi Star,

I cut and pasted your code however, the proposed solution has not seemed to work. Thanks for the attempt.

-Randall

[Star Strider]

It works for me:

Shed_Rg = rand(10,1);
Shed    = rand(10,1);
Uncertain_Rg = rand(10,1)+1;
Uncertain    = rand(10,1)+1;
Attached_Rg = rand(10,1)+2;
Attached    = rand(10,1)+2;

figure
h1 = scatter(Shed_Rg,Shed,'b','o');
hold on
h2 = scatter(Uncertain_Rg,Uncertain,'k','.');
hold on
h3 = scatter(Attached_Rg,Attached,'g','x');
legend([h1,h2,h3], 'Shed', 'Uncertain', 'Attached')