How to divide the area outside a polygon between left and right with respect to a certain given value in MATLAB? - matlab

Question

I have another blocking problem, I extracted the x and y coordinates outside the polygon, when plotting them the result is correct, however, I want to extract x and y coordinates on the right side outside the polygon(considered for x < 1078), and the x and y coordinates on the right side outside the polygon otherwise, however, when running this code (where I think it is a more logical one), it's dividing the whole set of coordinates (in and out of the polygon) between left and right.
This's my code, and the resulted images, the first one is the resulted plot of my code, and the second one is the initial polygon with the inside and outside areas, and if any one has a better idea I will appreciate their help, thanks a lot.
%% Check inpolygon function
nb_lignes = size(image_in_ref,1);
nb_colonnes = size(image_in_ref,2);
[Xq,Yq] = meshgrid(1:nb_colonnes,1:nb_lignes);%grille du cube
[in,on] = inpolygon(Xq,Yq,X_ref,Y_ref);
out = ~inpolygon(Xq,Yq,X_ref,Y_ref);
f = numel(Xq(in));
p = numel(Xq(on));
X_out = Xq(~in);
Y_out = Yq(~in);
figure
plot(X_ref,Y_ref) % polygon
axis equal
hold on
plot(Xq(in),Yq(in),'r-') % points inside
plot(X_out,Y_out,'b:') % points outside
plot(out,'y')
hold off
%% Cocatenate X_out and Y_out into one table
My_Matrix_out=horzcat(X_out(:),Y_out(:));
colNames = {'x_out','y_out'};
sTable_out = array2table(My_Matrix_out,'VariableNames',colNames);
%% Divide between left and right side limits
LeftTable_out = sTable_out(sTable_out.x_out< 1078, :);
RightTable_out = sTable_out(sTable_out.x_out >= 1078 , :);
%% Extract X and Y coordinates from each table separately
x_Left_out = LeftTable_out{:,'x_out'}; % or LeftTable{:,1}
y_Left_out = LeftTable_out{:,'y_out'}; % or LeftTable{:,2}
x_Right_out = RightTable_out{:,'x_out'};
y_Right_out = RightTable_out{:,'y_out'};
%% Plot Each Part Separately
figure
Left_Side_out =plot(x_Left_out,y_Left_out, 'r-');
hold on;
Right_Side_out=plot(x_Right_out, y_Right_out , 'g:');
The resulted plot of the posted code
The polygon with the inside and outside areas