Generate n pairs of random integers, whose 0 <= pairwise_sum <= k
3 ビュー (過去 30 日間)
古いコメントを表示
I want to generate n pairs of integers {(x_i, y_i)}, such that x_i + y_i <= k. One way I can think of is to generate one pair at a time
pairs = zeros(n,2)
for i=1:n
pairs(i,1) = randi(0,k);
pairs(i,2) = randi(0,k - pairs(i,1));
end
But, certainly, for loop is not favorable in matlab. Also, I'm not sure if that guarantees randomness either. I wonder if there's any existing function or a better way to do that?
Variation: consider a constraint that we want m% of generated pairs have pairwise_sum <= h ( h is some number < k). My approach won't work in this case. I'd love to get some hints to solve that as well.
Many thanks,
0 件のコメント
採用された回答
José-Luis
2014 年 9 月 29 日
編集済み: José-Luis
2014 年 9 月 29 日
num_pairs = 100;
max_val = 10;
tot_sum = randi(max_val + 1,[num_pairs,1]) - 1; %Need to include 0
result = rand(num_pairs,2);
result = bsxfun(@rdivide,result, sum(result,2));
result = round(bsxfun(@times,result,tot_sum));
plot(result)
I don't understand your second constraint.
3 件のコメント
José-Luis
2014 年 9 月 29 日
編集済み: José-Luis
2014 年 9 月 29 日
Yes, it is equivalent, except that it applies it to both columns.
Two ways to do the second constraint pop to my mind:
- Generate 70 samples with that constraint and add 30 with one such that 7 < h < 10
- Trim the generated sample until you reach your condition (get rid of some of the rows)
Please accept the answer that best solves your problem.
その他の回答 (0 件)
参考
カテゴリ
Help Center および File Exchange で Operating on Diagonal Matrices についてさらに検索
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!