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"""
Eigenvalue solver using iterative methods.
Find k eigenvectors and eigenvalues of a matrix A using the
Arnoldi/Lanczos iterative methods from ARPACK.
These methods are most useful for large sparse matrices.
- eigen(A,k)
- eigen_symmetric(A,k)
Reference
---------
- http://www.caam.rice.edu/
software/ARPACK/
- http://www.caam.rice.edu/software/ARPACK/UG/ug.html
- http://books.google.com/books?hl=en&id=4E9PY7NT8a0C&dq=arpack+users+guide
"""
global_symbols = []
postpone_import = 1
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