creatting a polygon in matlab

2020 10 4
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更新时间：2020 10 4
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hi
im going to create a polygon that is combination with points and function.
look at this picture
fourmula of top function is : y = 10+1*exp((-(x-15).^2)/10);
i want to creat a polygon the hatched figured
please help, thanks

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Matteo Lo Preti
Matteo Lo Preti 2020-10-4

0 个投票

x = linspace(0,30,50);
y = 10+1*exp((-(x-15).^2)/10);
x = [30 30 0 x];
y = [10 0 0 y];
warning('off', 'MATLAB:polyshape:repairedBySimplify')
polygon = polyshape(x,y);
figure;
plot(polygon);

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Mili Kian
Mili Kian 2020-10-4
thanks alot.
and im sorry,
i have another question i have a lot of points and i want to find if this points is in polygon or not ?
my points are:
X Y
0.50000000 0.50000000
0.50000000 1.5000000
0.50000000 2.5000000
0.50000000 3.5000000
0.50000000 4.5000000
0.50000000 5.5000000
0.50000000 6.5000000
0.50000000 7.5000000
0.50000000 8.5000000
0.50000000 9.5000000
0.50000000 10.500000
0.50000000 11.500000
0.50000000 12.500000
0.50000000 13.500000
0.50000000 14.500000
0.50000000 15.500000
1.5000000 0.50000000
1.5000000 1.5000000
1.5000000 2.5000000
1.5000000 3.5000000
1.5000000 4.5000000
1.5000000 5.5000000
1.5000000 6.5000000
1.5000000 7.5000000
1.5000000 8.5000000
1.5000000 9.5000000
1.5000000 10.500000
1.5000000 11.500000
1.5000000 12.500000
1.5000000 13.500000
1.5000000 14.500000
1.5000000 15.500000
2.5000000 0.50000000
2.5000000 1.5000000
2.5000000 2.5000000
2.5000000 3.5000000
2.5000000 4.5000000
2.5000000 5.5000000
2.5000000 6.5000000
2.5000000 7.5000000
2.5000000 8.5000000
2.5000000 9.5000000
2.5000000 10.500000
2.5000000 11.500000
2.5000000 12.500000
2.5000000 13.500000
2.5000000 14.500000
2.5000000 15.500000
3.5000000 0.50000000
3.5000000 1.5000000
3.5000000 2.5000000
3.5000000 3.5000000
3.5000000 4.5000000
3.5000000 5.5000000
3.5000000 6.5000000
3.5000000 7.5000000
3.5000000 8.5000000
3.5000000 9.5000000
3.5000000 10.500000
3.5000000 11.500000
3.5000000 12.500000
3.5000000 13.500000
3.5000000 14.500000
3.5000000 15.500000
4.5000000 0.50000000
4.5000000 1.5000000
4.5000000 2.5000000
4.5000000 3.5000000
4.5000000 4.5000000
4.5000000 5.5000000
4.5000000 6.5000000
4.5000000 7.5000000
4.5000000 8.5000000
4.5000000 9.5000000
4.5000000 10.500000
4.5000000 11.500000
4.5000000 12.500000
4.5000000 13.500000
4.5000000 14.500000
4.5000000 15.500000
5.5000000 0.50000000
5.5000000 1.5000000
5.5000000 2.5000000
5.5000000 3.5000000
5.5000000 4.5000000
5.5000000 5.5000000
5.5000000 6.5000000
5.5000000 7.5000000
5.5000000 8.5000000
5.5000000 9.5000000
5.5000000 10.500000
5.5000000 11.500000
5.5000000 12.500000
5.5000000 13.500000
5.5000000 14.500000
5.5000000 15.500000
then what am i do?
Matteo Lo Preti
Matteo Lo Preti 2020-10-4
Hi, have a look at the inpolygon function!

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更多回答（1 个）

Alan Stevens
Alan Stevens 2020-10-4

0 个投票

You could also use the patch function
x = [0 0:30 30 0];
y = [0 10+exp((-(x(2:end-2)-15).^2)/10) 0 0];
patch(x,y,'r')

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