# improving the creation of subpolygons

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Riccardo Tronconi on 29 Jul 2021
Commented: Adam Danz on 31 Jul 2021
HI guys! I have a macro-polygon 10x10 and I would like to divide it into 25 equal parts of width and height equal to 2. So far I have created this lines of code but I was wondering if there is a much efficient way to implement it.
pgon = polyshape([0 0 10 10],[10 0 0 10]);
plot(pgon);
p(1) = rectangle('position', [0,0,2,2] );
p(2) = rectangle('position', [2,0,2,2] );
p(3) = rectangle('position', [4,0,2,2] );
p(4) = rectangle('position', [6,0,2,2] );
p(5) = rectangle('position', [8,0,2,2] );
p(6) = rectangle('position', [0,2,2,2] );
p(7) = rectangle('position', [2,2,2,2] );
p(8) = rectangle('position', [4,2,2,2] );
p(9) = rectangle('position', [6,2,2,2] );
p(10) = rectangle('position', [8,2,2,2] );
p(11) = rectangle('position', [0,4,2,2] );
p(12) = rectangle('position', [2,4,2,2] );
p(13) = rectangle('position', [4,4,2,2] );
p(14) = rectangle('position', [6,4,2,2] );
p(15) = rectangle('position', [8,4,2,2] );
p(16) = rectangle('position', [0,6,2,2] );
p(17) = rectangle('position', [2,6,2,2] );
p(18) = rectangle('position', [4,6,2,2] );
p(19) = rectangle('position', [6,6,2,2] );
p(20) = rectangle('position', [8,6,2,2] );
p(21) = rectangle('position', [0,8,2,2] );
p(22) = rectangle('position', [2,8,2,2] );
p(23) = rectangle('position', [4,8,2,2] );
p(24) = rectangle('position', [6,8,2,2] );
p(25) = rectangle('position', [8,8,2,2] );
Many thanks to all in advance!!
Adam Danz on 31 Jul 2021
There are much easier ways to accomplish this but based on your comment in a related thread, it sounds like you don't need to display the rectangles at all.

Steven Lord on 29 Jul 2021
Divide visually or computationally?
big = polyshape([0 10 10 0 0], [0 0 10 10 0]);
p = repmat(big, 5, 5); % Preallocate
edges = 0:2:10;
for x = 1:(numel(edges)-1)
E1 = edges(x + [0 1 1 0 0]);
for y = 1:(numel(edges)-1)
E2 = edges(y + [0 0 1 1 0]);
p(x, y) = polyshape(E1, E2);
end
end
figure
plot(big)
figure
plot(p(1:2:25), 'EdgeColor', 'k')
Note that by the way I constructed the elements of p, the first one is in the lower-left corner.