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tblite
Light-weight tight-binding framework
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Reduces a real symmetric-definite generalized eigenproblem to standard form. More...
Public Member Functions | |
| pure subroutine | wrap_ssygst (amat, bmat, info, itype, uplo) |
| pure subroutine | wrap_dsygst (amat, bmat, info, itype, uplo) |
Reduces a real symmetric-definite generalized eigenproblem to standard form.
If ITYPE = 1, the problem is A*x = lambda*B*x, and A is overwritten by inv(U**T)*A*inv(U) or inv(L)*A*inv(L**T)
If ITYPE = 2 or 3, the problem is A*B*x = lambda*x or B*A*x = lambda*x, and A is overwritten by U*A*U**T or L**T*A*L.
B must have been previously factorized as U**T*U or L*L**T by POTRF.
1.10.0