Choose randomly rows in a matrix
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hi I have a matrix with 2 columns, the first is for 'ID', the second is for 'age'. I want to randomly pick 'n'(e.g. 2) IDs of the matrix and return the IDs and the age of the same row.
Thanks
0 commentaires
Réponses (1)
Sean de Wolski
le 12 Juin 2013
doc randperm
Then use the output of this as an index into your matrix.
x = magic(10);
idx = randperm(10,2)
x(idx,:)
3 commentaires
Walter Roberson
le 13 Juin 2013
You are using an old version of MATLAB that does not support that syntax for randperm. Instead use
idx = randperm(size(x,1));
x(idx(1:2),:)
Voir également
Catégories
En savoir plus sur Creating and Concatenating Matrices dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!