How can I set one lsline using gscatter?

Hi,

So, I got 4 groups. By using gscatter I can colour each group. Now I want one lsline but I got 4 differnet lsline, one per group.

group=[zeros(str2num(answer{1,1}),1);1+zeros(str2num(answer{2,1}),1);...
    2+zeros(str2num(answer{3,1}),1);3+zeros(str2num(answer{4,1}),1)];
group=string(group);
group=strrep(group, '0', 'Wt');
group=strrep(group, '1', 'Cpx II Ko');
group=strrep(group, '2', 'Cpx II Ko + Cpx I');
group=strrep(group, '3', 'Cpx II Ko + Cpx II');

h =gscatter(x,y,group);

hold on
lh = lsline; 

This is my code. By doing this I got 4 different lslines. I want a single lsline made by all the values from x and y.

I've also tried this:

figure(1)
scatter(x_ko,y_ko,25,'LineWidth',2);
hold on
scatter(x_wt,y_wt,25,'LineWidth',2);
hold on
scatter(x_kowt,y_kowt,25,'LineWidth',2);
hold on
scatter(x_ko2,y_ko2,25,'LineWidth',2);
hold on
lh = lsline; 

Same result, 4 lsline. I want one lsline for

This is the plot. 4 lsline. One each group. I want one lsline from all the dots.

Alternatively, I can use scatter(x,y) but then I do not know how to paint the dots by groups.

Answer 1

[Adam Danz]

Use coeffs = polyfit(x,y,1) to compute the regression line for all of the data and then refline(coeffs) to plot the regression line.

[Jose Rego Terol]

Thanks! I didn't realize about this option.