How can I generate three random matrices from 20 percent of the rows of a 2000 by 80 matrix, using for loop?
1 view (last 30 days)
Show older comments
Let's X=[2000 by 80]. Now I want to get X1, X2 and X3 randomly from X. Each matrix is 20 percent of the X.
Please help me out.
Thank you
0 Comments
Accepted Answer
DGM
on 24 Jun 2021
I don't see why a loop is necessary. Is it?
A = rand(2000,80); % test array
s = size(A,1);
nrows = round(s*0.2);
X1 = A(randperm(s,nrows),:);
X2 = A(randperm(s,nrows),:);
X3 = A(randperm(s,nrows),:);
0 Comments
More Answers (1)
Chunru
on 24 Jun 2021
a = magic(20);
for i = 1:3
idx = randperm(20, 4); % 4 is 20% of 20; for your case 2000*20%
b = a(idx, :)
end
0 Comments
See Also
Categories
Find more on Creating and Concatenating Matrices in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!