I keep receiving an error saying "execution of script drawpolygon as a function is not supported", even though it has previously worked.

My code:

for k=1:3
    c{k} = zeros(1,3);
end
for k = 1:3
    tmp = input(['Press any key to draw Polygon # ' int2str(k) ': ']);
    close all, imshow(I), title(['Polygon # ' int2str(k)])
    h = drawpolygon;
    % The vertices of k-th polygon is recorded in polyin{k}
    polyin{k} = polyshape(h.Position); % create a polygon object
    [cx,cy] = centroid(polyin{k});
    c{k}(1:2) = round([cx cy],0);  % unit: pixels
    c{k}(3) = round(area(polyin{k}),0)*p2cm;   % unit: cm^2 
    if k==3
        tmp = input('Press any key to complete.')
    end
    disp(['Centroid of polygon: [' int2str([cx cy]) ']'])
    disp(['Area of polygon = ' int2str(c{k}(3)) 'cm^2'])
end

The error:

The code is being used to draw 3 different polygons on one image.

Thanks!

Answer 1

[KSSV]

It looks like you have named the present code as drawpolygon. No you should not name it on that name as drawpolygon is a inbuilt function. Rename the present file into a different name, then run and see.

[ISABELLE GUNDRUM]

Okay thank you, this helped!

[KSSV]

Thanks is accepting / voting the answer.

Answer 2

[Jan]

The message means, that drawpolygon is a script. Then it does not have input nd output arguments:

  h = drawpolygon;
% ^^^  omit this

But you do need the handle h later. Therefore I guess, that the line, which defines the script as a function was deleted by accident. What is the contents of drawpolygon.mlx?