MATLAB: Plot a polygon without intersection

Question

Hi everyone I have the matrix below and 1st row refers x-coordinates and 2nd row refers y-coordinates. When I plot it, I get the polygon that I do not want with several intersections due to array of the elements in the out matrix. You can see in the figure below. So, How can I arrange of the elements' array of this matrix to get smooth polygon. For example, the points should be in this aray (1,4) , (2,4) , (3,4) , (3,5) , (2,5) , (1,5). of course, the first point can be changed.

out = [  1     1     2     2     3     3;
         4     5     4     5     4     5]
pgon = polyshape([out(1,:)], [out(2,:)]);
plot(pgon)
grid on

Answer 1

k = boundary(out.');
plot(out(1,k), out(2,k))

... but it will just look like a square.