How to plot more multiple different regression lines in matlab

Hi, I going to plot multiple regression lines in a Figure with different regression coefficient of each line. The purple data points are the predicted values based on different regression lines. I m not going to use the polyfit() or polyval() because i have my own way to generate the regression coefficient. Based on the the equation below:

for i=1:length(pointsMissing)
        if (K==2)
            X(pointsMissing(i),2) = b2(1) + b2(2) * X(pointsMissing(i),1) + err_z2(i);
        else          
            X(pointsMissing(i),2) = b1(1) + b1(2) * X(pointsMissing(i),1) + err_z1(i);
       end
    end

I really hope that anyone can give me some ideas on how to do that. Thank you

Answer 1

[Jos (10584)]

If you have the regression coefficients (a,b) (a sin the formula: y = ax +b), the command

h = refline(a,b)

will plot this line in the current graph. Using the handle h, you can set all aspects, like colour

h.Color = 'r' ;

[amj]

Thanks a million Jos (10584). Let me try

[amj]

Dear Jos (10584), It is works as what i want.. Thank you very much