Find random samples of some rows in the matrix and ensure the rank
1 vue (au cours des 30 derniers jours)
Afficher commentaires plus anciens
I have a matrix 'A':
A = [ 1.2285 -1.2285 2.3433e-17 -4.1658e-17
0.70827 -0.70827 1.351e-17 -2.4017e-17
-1.2285 1.2285 -4.1658e-17 5.9885e-17
-1.8226e-17 4.1658e-17 1.0932 -1.1271
-2.4017e-17 2.4017e-17 0.63025 -0.64979
-4.1658e-17 4.1658e-17 -1.161 1.1948
0 0 1.1159 0
0 0 0 1.0901];
I want to find the random sample of some rows 'index' in matrix 'A' so that each sample A(index,:) ensure rank.
0 commentaires
Réponse acceptée
Matt J
le 1 Mai 2021
Modifié(e) : Matt J
le 1 Mai 2021
What does it mean to "ensure the rank"? Do you mean you want to find a random full-rank subset of rows? If so,
A = [ 1.2285 -1.2285 2.3433e-17 -4.1658e-17
0.70827 -0.70827 1.351e-17 -2.4017e-17
-1.2285 1.2285 -4.1658e-17 5.9885e-17
-1.8226e-17 4.1658e-17 1.0932 -1.1271
-2.4017e-17 2.4017e-17 0.63025 -0.64979
-4.1658e-17 4.1658e-17 -1.161 1.1948
0 0 1.1159 0
0 0 0 1.0901];
M=size(A,1);
N=rank(A);
B=[];
while rank(B)<N
index=randperm(M,N);
B=A(index,:);
end
index=sort(index),
B=A(index,:)
Plus de réponses (0)
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!