how can i calculate a complex polygon with coordinates in matlab ?

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ADNAN KIRAL
ADNAN KIRAL 2020-10-19
评论： ADNAN KIRAL 2020-10-19
Hi,
how can I calculate A complex polygon in Matlab?
image shows what I need to calculate in Matlab. do you guys have any code for that ? or are there any Matlab command which can calculate it by coordinates?
thanks in advance
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ADNAN KIRAL
ADNAN KIRAL 2020-10-19
thanks for your reply.
calculation of the area !.
I have a large number of coordinates. If I can code it in Matlab. I will replace with my coordinates. So that I need to know how to calculate the area of such shape.

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Ameer Hamza
Ameer Hamza 2020-10-19
The equation in your comment can be written in MATLAB like this
A = 1/2*sum(x(1:end-1).*y(2:end)-y(1:end-1).*x(2:end));
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Ameer Hamza
Ameer Hamza 2020-10-19
You can try something like this
X;
Y;
A = zeros(1, numel(X)-2);
for i = 1:numel(A)
x = X(1:i+2);
y = Y(1:i+2);
A(i) = 1/2*sum(x(1:end-1).*y(2:end)-y(1:end-1).*x(2:end));
end

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Durganshu
Durganshu 2020-10-19
You can use polyarea for accomplishing your task. The documentation is here:
https://in.mathworks.com/help/matlab/ref/polyarea.html
Hope that helps!
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ADNAN KIRAL
ADNAN KIRAL 2020-10-19
thanks for reply.
one more question please ? how can I get coordinate vs. area ( at the end, I need to know how the area is increasing with coordinate change)
I have tried "cumsum" Matlab command, but it did not work. it gave the total area. thanks

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Steven Lord
Steven Lord 2020-10-19
If you want to do more than just compute its area I would use polyshape for that.
>> x = [7 7 5 3 -5 0 -8 2 -4];
>> y = [-7 3 -6 3 3 8 3 -3 -8];
>> P = polyshape(x, y);
>> plot(P)
There are a number of questions you can ask about a polyshape and a number of operations you can perform on one.

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