Find random samples of some rows in the matrix and ensure the rank
2 views (last 30 days)
Show older comments
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 Comments
Accepted Answer
Matt J
on 1 May 2021
Edited: Matt J
on 1 May 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,:)
More Answers (0)
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!