poly2cw doesn't work for this simple rectangle. I have an example here. Could you please check this code?

Xs{1}=[
     0
     1
     1
     1
     0
     1]

Ys{1}=[1.0000
    1.0000
    0.0101
         0
         0
    0.5000]

[xr,yr]=poly2cw( Xs{1}   , Ys{1}    )

for i=1:length(xr)
plot(xr(i),yr(i),'or')
hold on
drawnow
pause
end