How to get random values from a matrix
1 visualización (últimos 30 días)
Mostrar comentarios más antiguos
Iftekharuddin Syed
el 10 de Nov. de 2020
Comentada: Bruno Luong
el 10 de Nov. de 2020
There is a matrix A (size:12x1000)
How can I select 5 random entries out of 1000( from a matrix of size 12x1000), with each randomly selected value contains all the 12 rows from the original matrix. And store it into another matrix of size 12x5.
Can anyone help me with the code.
0 comentarios
Respuesta aceptada
Ameer Hamza
el 10 de Nov. de 2020
You can use randperm() in a for-loop
M = rand(12, 1000);
rand_elements = zeros(12, 5);
for i = 1:12
idx = randperm(1000, 5);
rand_elements(i,:) = M(i, idx);
end
0 comentarios
Más respuestas (2)
Bruno Luong
el 10 de Nov. de 2020
rcols = randperm(size(A,2),5);
B = A(:,rcols)
2 comentarios
Bruno Luong
el 10 de Nov. de 2020
I just interpret the question like this. I don't know if it's what OP wants or not.
Ver también
Categorías
Más información sobre Creating and Concatenating Matrices en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!