How can I plot the indices of observation in class 1?

How can I plot indices of observation in class 1 in red on the same plot?

current code I have for class 0:

>> I = find(ttr == 0);

>> scatter(Xtr(I,1), Xtr(I,2), 10, ’b’);

>> hold on;

I need indices of observation in class 1 for be red in the same plot

Answer 1

[KSSV]

load tremor(1).mat ; 
id1 = ttr==0 ; 
id2 = ttr == 1 ;

plot(Xtr(id1,1),Xtr(id1,2),'*r') ;
hold on
plot(Xtr(id2,1),Xtr(id2,2),'*b') ;

OR

scatter(Xtr(:,1),Xtr(:,2),[],ttr)

Also read about gscatter.

[uzoma bob]

I have a similar code but the issue is it is only showing me the red indices on a single plot but not with both the blue and red?

[KSSV]

did you use hold on ?

[uzoma bob]

Yeah and it is still loading one for the red and then when i close it will load once in blue but not both in the same singular plot

[uzoma bob]

Ok I got it now thank you!

[uzoma bob]

I think the issue was I was closing the plot rather than loading the second plot

[KSSV]

Siggetsed to use gscatter. Read about it.