Using randsample to randomize rows

2 次查看（过去 30 天）
Joel Schelander
Joel Schelander 2021-3-30
编辑： David Hill 2021-3-30
I have 36 households. I want to study combinations of households. PR represents how many households that are combined. To make other calculations
feasible, I sample the data using randsample. However, when I increase PR to 9 or more, the number of combinations become to great for me to sample like this. Can I integrate the sampling with nchoosek somehow, or is there another way?
nHousehold =36;9 or
PR=7 ; %Number of Households that are to be selected
Hcombos=nchoosek(1:nHousehold,PR); %Number of combinations
y = randsample(length(Hcombos(:,1)),2);
Hcombosnew=[];
for b=1:2
Hcombosnew=[Hcombosnew; Hcombos(y(b),:)];
end
  2 个评论
David Hill
David Hill 2021-3-30
Do you have to test all combinations or just a random sampling of the combinations?
Joel Schelander
Joel Schelander 2021-3-30
Just a random sampling, since there will be too many combinations

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

David Hill
David Hill 2021-3-30
编辑：David Hill 2021-3-30
You could run a loop however many times you want to generate the sampling and then make sure they are all different.
y=zeros(1e5,9);
for k=1:1e5
y(k,:)=randperm(36,9);
end
y=unique(sort(y,2),'rows');

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息

标签

产品


版本

R2019a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by