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@ -53,7 +53,7 @@ def rayleigh_quotient_iteration(operator: sparse.spmatrix or spalg.LinearOperato
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:return: (eigenvalue, eigenvector)
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"""
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try:
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_test = operator - sparse.eye(operator.shape)
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_test = operator - sparse.eye(operator.shape[0])
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shift = lambda eigval: eigval * sparse.eye(operator.shape[0])
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if solver is None:
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solver = spalg.spsolve
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