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[eigensolvers] Increase number of lanczos vectors (ncv) based on number of requested eigenvalues

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jan 2025-12-10 23:07:28 -08:00
parent c46bed8298
commit be647658d3
1 changed files with 1 additions and 1 deletions
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meanas/eigensolvers.py
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@ -135,7 +135,7 @@ def signed_eigensolve(
shifted_operator = operator + spalg.LinearOperator(shape=operator.shape,
matvec=lambda v: shift * v)
shifted_eigenvalues, eigenvectors = spalg.eigs(shifted_operator, which='LM', k=how_many, ncv=50)
shifted_eigenvalues, eigenvectors = spalg.eigs(shifted_operator, which='LM', k=how_many, ncv=2 * how_many + 50)
eigenvalues = shifted_eigenvalues - shift
k = eigenvalues.argsort()