Loop with "for" and "if" and then a scatter with different colors

I would like one scatter plot with two different colors for different fields.

I have one table with x1, x2, y3.

I make one scatter with scatter(x1,x2,"o","filled"), but I would like that colors were on the base of y3.

Y3 has values from 0 to 81. I would like that fields with values<10 were green, vice versa values>10 were red.

Answer 1

[DGM]

Consider the example

% placeholder data
x1 = rand(100,1);
x2 = rand(100,1);
y1 = randi([0 81],100,1);

mask = y1<10; % create a mask

% plot the two sets
scatter(x1(mask),x2(mask),50,"og","filled"); hold on
scatter(x1(~mask),x2(~mask),50,"or","filled")

Alternatively, you could use colormapping:

figure
cmap = permute(ind2rgb(mask+1,[1 0 0; 0 1 0]),[1 3 2]);
scatter(x1,x2,50,cmap,"o","filled")

Answer 2

[dpb]

Alternatively, gscatter with @DGM example...

gscatter(x1,x2,mask,[],[],[],0,'X Variable','Y Variable')
legend('Level 1','Level 2','Location',"northoutside","Orientation",'horizontal')

See the doc for gscatter for all the possible variations of input parameters.