Folded spectrum method
In mathematics, the folded spectrum method (FSM) is an iterative method for solving large eigenvalue problems. Here you always find a vector with an eigenvalue close to a search-value . This means you can get a vector in the middle of the spectrum without solving the matrix.
, with and the Identity matrix.
In contrast to the Conjugate gradient method, here the gradient calculates by twice multipling matrix
- J. K. L. MacDonald, Phys. Rev. 46, 828 - 828 (1934)
- W. Wang and A. Zunger, J. Phys. Chem. 98, 2158 (1994)
- W. Wang and A. Zunger, J. Chem. Phys. 100, 2394 (1994)
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