selecting random values

2 次查看（过去 30 天）
kash
kash 2012-1-12
I have a matrix of 10x10
i want to select random values such that my matrix form should be 3x3 or 6x6 or 7x7
please help
  1 个评论
Walter Roberson
Walter Roberson 2012-1-12
In the 3x3 (say), do all of the elements in the same row of the result have to have come from the same row in the original matrix? And for the columns? So should the selection be of N rows against N columns?

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Andrei Bobrov
Andrei Bobrov 2012-1-12
A = randi(48,3,10)
n = 3;
q = reshape(1:numel(A),n,[]);
rc = size(A)- n +1;
m = q(1:rc(1),1:rc(2));
p = m(randperm(numel(m),1));
out = A(rem(p-1,n(1))+(1:n(1)),ceil(p/n(1))+(0:n(2)-1))
OR
A = randi(48,10)
n = [4,6];
i1 = arrayfun(@(x)randi( size(A,x)- n(x) + 1) + (0:n(x)-1),1:2,'un',0);
out = A(i1{:})

类别

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

标签

Community Treasure Hunt

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

Start Hunting!

Translated by