Create a random Matrix
1 次查看(过去 30 天)
显示 更早的评论
I have a 8 column vector n*1. Can I create a Random matrix of n*8?
The function must take one value from each vector and create a matrix with 8 columns and n rows.
Please help me :-)
2 个评论
Jan
2011-10-24
"I have a 8 column vector" sounds like a single vector. But "from each vector" might mean n vectors. Confusing.
采纳的回答
Andrei Bobrov
2011-10-24
A1,A2,..,A8 - your vectors (nx1), let n = 5;
for j1 = 1:8, eval([sprintf('A%d',j1),'=randi(20,5,1)']); end
A = eval(['[',sprintf('A%d,',1:8),']'])
out=A(bsxfun(@plus,cell2mat(arrayfun(@(x)randperm(n)',(1:8),'un',0)),(0:7)*n))
3 个评论
更多回答(1 个)
Walter Roberson
2011-10-24
rv(:,1) = randomvector1;
rv(:,2) = randomvector2;
rv(:,3) = randomvector3;
....
rv(:,4) = randomvector4;
rants = zeros(8, n);
for K = 1:n
rants(:,K) = A Random Selection of One Entry Per Column from rv
end
How to do "A Random Selection of One Entry Per Column from rv" is left to you to work on in more detail. I will hint that it involves using rand().
3 个评论
Walter Roberson
2011-10-30
floor(1 + n * rand())
will give you a random row number.
If I say much more than I will be completing your assignment for you.
另请参阅
类别
在 Help Center 和 File Exchange 中查找有关 Creating and Concatenating Matrices 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!