SBGST: reduces a real symmetric-definite banded generalized eigenproblem A*x = lambda*B*x to standard form C*y = lambda*y, such that C has the same bandwidth as A. B must have been previously factorized as S**T*S by DPBSTF, using a split Cholesky factorization. A is overwritten by C = X**T*A*X, where X = S**(-1)*Q and Q is an orthogonal matrix chosen to preserve the bandwidth of A.
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| pure subroutine | dsbgst (vect, uplo, n, ka, kb, ab, ldab, bb, ldbb, x, ldx, work, info) |
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| | la_dsbgst |
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| | la_qsbgst |
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| pure subroutine | ssbgst (vect, uplo, n, ka, kb, ab, ldab, bb, ldbb, x, ldx, work, info) |
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| | la_ssbgst |
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SBGST: reduces a real symmetric-definite banded generalized eigenproblem A*x = lambda*B*x to standard form C*y = lambda*y, such that C has the same bandwidth as A. B must have been previously factorized as S**T*S by DPBSTF, using a split Cholesky factorization. A is overwritten by C = X**T*A*X, where X = S**(-1)*Q and Q is an orthogonal matrix chosen to preserve the bandwidth of A.
◆ dsbgst()
| pure subroutine la_lapack::sbgst::dsbgst |
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character, intent(in) | vect, |
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character, intent(in) | uplo, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | ka, |
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integer(ilp), intent(in) | kb, |
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real(dp), dimension(ldab,*), intent(inout) | ab, |
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integer(ilp), intent(in) | ldab, |
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real(dp), dimension(ldbb,*), intent(in) | bb, |
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integer(ilp), intent(in) | ldbb, |
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real(dp), dimension(ldx,*), intent(out) | x, |
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integer(ilp), intent(in) | ldx, |
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real(dp), dimension(*), intent(out) | work, |
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integer(ilp), intent(out) | info ) |
◆ la_dsbgst()
| la_lapack::sbgst::la_dsbgst |
◆ la_qsbgst()
| la_lapack::sbgst::la_qsbgst |
◆ la_ssbgst()
| la_lapack::sbgst::la_ssbgst |
◆ ssbgst()
| pure subroutine la_lapack::sbgst::ssbgst |
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character, intent(in) | vect, |
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character, intent(in) | uplo, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | ka, |
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integer(ilp), intent(in) | kb, |
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real(sp), dimension(ldab,*), intent(inout) | ab, |
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integer(ilp), intent(in) | ldab, |
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real(sp), dimension(ldbb,*), intent(in) | bb, |
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integer(ilp), intent(in) | ldbb, |
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real(sp), dimension(ldx,*), intent(out) | x, |
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integer(ilp), intent(in) | ldx, |
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real(sp), dimension(*), intent(out) | work, |
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integer(ilp), intent(out) | info ) |
The documentation for this interface was generated from the following file:
