How can I draw without replacement?

Question

Mint 2022-1-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633785-how-can-i-draw-without-replacement

编辑： Mint 2022-1-22

I want a 30-by-40 matrix where each element is one of {1,2,3,4,5,6,7,8,9,10,0,0,0,0,0,0,0, 0,0,0} (or values 1 to 10 and the rest zeros). I have N=30, each going through 40 passes. First the first 20 values are to be drawn without replacement, and then the next 20 values without replacement, so that there are 40 draws per N. The values should then be saved in a text file, separated by commas. Thank yor for all suggestions!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Matt J 2022-1-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1633785-how-can-i-draw-without-replacement#answer_879425

编辑：Matt J 2022-1-22

在 MATLAB Online 中打开

S=[1,2,3,4,5,6,7,8,9,10,0,0,0,0,0,0,0, 0,0,0];
[~,is1]=sort(rand(30,20),2);
[~,is2]=sort(rand(30,20),2);
result=S([is1,is2])
result = 30×40
     3     9     0     0     4    10     5     0     8     0     6     0     0     0     0     0     1     0     2     7    10     0     0     6     9     0     0     4     1     0
     0     0     3     0     0     4     8     0     9     1     7     2     0     5    10     0     6     0     0     0     0    10     5     0     2     0     3     0     9     4
     0     6     7     0     9     0     5     1     0     8     0     3     0     0     4     0     2     0     0    10     0     0     0     0     9     7     3     0    10     8
     0     0     6     0     4    10     0     9     0     5     0     7     2     8     0     0     3     0     1     0     5     9     8     3     0     4     0     0    10     1
     1     0     2     0     8     9     7     0     0     6     0     4    10     0     0     0     3     5     0     0     8     0     0     5     9     6     3     2     0     0
     0     0     0     8     9     7     0     6     0     0     0     0     2     3     4     0     5    10     0     1     0     0     4     0     0     1     0     0     5    10
     0     0     7     1    10     9     0     3     4     8     6     0     0     5     0     0     2     0     0     0    10     1     0     3     0     0     0     0     0     0
     0    10     0     0     0     0     0     4     0     0     0     6     8     9     1     5     0     3     7     2     4     1     0     0     0     0     2     0     0     9
     9     0     0     0     0     0     8     7     0     2     4     0     1     0     5     6     0     3    10     0     0     0     4     0     0     0     7     0     3     0
     7     0     5     0     0     9     0     0     8     0     2     6     0     0     0    10     1     0     3     4     0     0     8    10     0     7     6     0     0     2
writematrix(result)