MATLAB: Change the color of points laying inside or on the edge of polygon

countinpolygonpoints

Hi,
I tried to change the color of points laying inside and on the edge of a parallelogram from cyan to blue (image1). I used the command inpolygon to do that, but not all the points on the edge of the parallelogram change to blue (image2). I also need to count the number of blue points inside the parallelogram. The syntax that I use is as follows :
clc;clear;
% using equation to approximate Pd
% defining variables
U=7;
V=9;
R=4;
L=60;
Pdo=2.*R./L.*sqrt(1+(V/U).^2);
Pd=min(1,Pdo);
% creating polygon
xv=[0 10 60 50 0];
yv=[0 0 40 40 0];
rng default;
% generate random points inside rectangle
xq = rand(10000,1).*60;
yq = rand(10000,1).*40;
[in,on] = inpolygon(xq,yq,xv,yv);
count1=numel(xq,yq(in));
count2=numel(xq,yq(on));
count=count1+count2;
disp(count);
% numel(xq(on));numel(xq(~in));
figure
%plotting
plot(xv,yv);
axis equal
grid on
hold on;
plot(xq(in),yq(in),'bo') % points inside
plot(xq(~in),yq(~in),'co') % points outside
hold off
can anyone please spot the mistake that I have made?

Best Answer

sum(in)
gives you the number of points lying inside the polygon. Points which are and inside the polygon are blue in color. Try replacing the marker from 'O' to '.' and see.
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