Concentric Squares with random points

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Lewis HC 2020-5-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/530828-concentric-squares-with-random-points

评论： Rena Berman 2020-6-1

Hi to everybody

Someone could I help me how to create a script for two concentric squares so that I have a set of points in the difference of areas?

I have this initial code:

With the last script I reach to create two areas but I need only the points in the difference of areas

Thank you to everybody!

Thank you guys!!!

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KSSV 2020-5-23

编辑：KSSV 2020-5-23

You have changed the original question.....even you have unaccepted the accepted answer, even you have deleted your comment where you said thanks for the solution....why? It is not ethical of you.

Rena Berman 2020-6-1

(Answers Dev) Restored edit

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Answer 1

KSSV 2020-5-23

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/530828-concentric-squares-with-random-points#answer_436788

在 MATLAB Online 中打开

clc; clear all ;
% Inner Square 
S1 = [-5 -5 ; 5 -5 ; 5 5 ; -5 5] ;
% Outer Square 
S2 = [-10 -10 ; 10 -10 ; 10 10 ; -10 10] ;
% Generqate random points 
a = -10 ; b = 10 ; 
N = 100000 ; 
x = (b-a)*rand(N,1)+a ; 
y = (b-a)*rand(N,1)+a ; 
% poins which lie inside S1 
idx = inpolygon(x,y,S1(:,1),S1(:,2)) ;
% plot
x = x(~idx) ; y = y(~idx) ; 
plot(x,y,'.b')