How to reload, plot and edit a polygon created by drawpolygon

Hi everybody,

I am trying to reload, plot and edit the polygon that I created by drawpolygon and saved in ".mat" file. The code is as below

% hTWN = drawpolygon('FaceAlpha',0); hTWN.Color='green'; hTWN.LineWidth=1; save ('Polygon_TWN.mat','hTWN'); 
load Polygon_TWN.mat;
figure; 
plot(hTWN);

However, I got the folowing error

>> Untitled5
Error using plot
Not enough input arguments.

Error in Untitled5 (line 4)
plot(hTWN);        

Could you please help to point out how to solve this. Much appreciated!

[Walter Roberson]

In the code, before the load, add

hTWN = [];

Otherwise in current MATLAB, the parser would assume that the load is not going to "poof" variables into existence.

You could also use

TWN_struct = load('Polygon_TWN.mat');
figure;
plot(TWN_struct.hTWN);