tblite_lapack_sygst::wrap_sygst Interface Reference

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)

Detailed Description

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.

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The documentation for this interface was generated from the following file:

• /home/runner/work/tblite/tblite/src/tblite/lapack/sygst.f90