Count in a loop

Question

BMNX 2019-9-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481548-count-in-a-loop

评论： KALYAN ACHARJYA 2019-9-22

Imagine a square with sides of 2 meter. In the centre is point M, at (0,0). We randomly throw darts at this square, which all hit at some location p on the square (uniform distribution). Next, we count the number of ‘hits’. Each dart is a hit when the distance from p to M is less than or equal to 1.

I have this code I dont know how to count the number of p that is less than or equal to 1

for i=1:100;

p_x= -1+(1+1)*rand;

p_y= -1+(1+1)*rand;

p = sqrt((p_x)^2 + (p_y)^2)

end;

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Answer 1

KALYAN ACHARJYA 2019-9-22

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481548-count-in-a-loop#answer_392972

编辑：KALYAN ACHARJYA 2019-9-22

在 MATLAB Online 中打开

"I have this code I dont know how to count the number of p that is less than or equal to 1"

count=0;
for i=1:100
    p_x= -1+(1+1)*rand;
    p_y= -1+(1+1)*rand;
    p = sqrt((p_x)^2 + (p_y)^2)
   if p<=1
   count=count+1;
   end
end
fprintf('The p count is (when p<=1): %d',count);

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BMNX 2019-9-22

Thank you so much

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Answer 2

madhan ravi 2019-9-22

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/481548-count-in-a-loop#answer_392978

在 MATLAB Online 中打开

N = 100; % no loops needed
p_x= -1+(1+1)*rand(N,1);
p_y= -1+(1+1)*rand(N,1);
p = sqrt(p_x.^2 + p_y.^2);
fprintf('No of times P less than or equal to one:%d',nnz(p<=1))