Hui
Posts:
5
Registered:
8/2/14


Solving sparse Ax=b without certain eigenvector spaces
Posted:
Aug 2, 2014 6:13 PM


Hi, I'm trying to solve a sparse Ax=b problem. The size of A is about 10^4 by 10^4. A is pretty singular and the first a few eigenvalues of A is about 10^(12), 10^(6) and 10^(4). I'm able to find the first a few eigenvalues and eigenvectors using the command eigs, which takes only one or two seconds. Now I want to find x, such that Ax=b, but I want to exclude the first three eigenvectors.
Are there any simple ways that allow me to do this?

