how to random initialize svd function in matlab??
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
Fethi Bencherki
am 5 Mär. 2020
Beantwortet: Christine Tobler
am 5 Mär. 2020
i want the svd function in matlab to give me two different values for the same matrix , i mean the U and V , currently im getting the same everytime i run
0 Kommentare
Akzeptierte Antwort
Christine Tobler
am 5 Mär. 2020
The linear algebra functions in MATLAB are run-to-run reproducible, meaning if you call them twice with the exact same input, you get the exact same output.
If you want to randomize the output, you could pre-multiply the matrix with two random orthogonal matrices, and then apply does matrices to the outputs U and V:
[m, n] = size(A);
U0 = orth(randn(m));
V0 = orth(randn(n));
[U, S, V] = svd(U0*A*V0');
U = U0'*U;
V = V0'*V;
norm(A - U*S*V', 'fro')
This will still return the same singular values (which are unique), but returns different singular vectors.
0 Kommentare
Weitere Antworten (1)
KALYAN ACHARJYA
am 5 Mär. 2020
data_test=magic(3);
[U,S,V]=svd(data_test)
Result
U =
-0.5774 0.7071 0.4082
-0.5774 0.0000 -0.8165
-0.5774 -0.7071 0.4082
S =
15.0000 0 0
0 6.9282 0
0 0 3.4641
V =
-0.5774 0.4082 0.7071
-0.5774 -0.8165 -0.0000
-0.5774 0.4082 -0.7071
>>
1 Kommentar
Siehe auch
Kategorien
Mehr zu Eigenvalues finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!