SBGVD: computes all the eigenvalues, and optionally, the eigenvectors of a real generalized symmetric-definite banded eigenproblem, of the form A*x=(lambda)*B*x. Here A and B are assumed to be symmetric and banded, and B is also positive definite. If eigenvectors are desired, it uses a divide and conquer algorithm. The divide and conquer algorithm makes very mild assumptions about floating point arithmetic. It will work on machines with a guard digit in add/subtract, or on those binary machines without guard digits which subtract like the Cray X-MP, Cray Y-MP, Cray C-90, or Cray-2. It could conceivably fail on hexadecimal or decimal machines without guard digits, but we know of none.
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| pure subroutine | dsbgvd (jobz, uplo, n, ka, kb, ab, ldab, bb, ldbb, w, z, ldz, work, lwork, iwork, liwork, info) |
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| | la_dsbgvd |
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| | la_qsbgvd |
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| pure subroutine | ssbgvd (jobz, uplo, n, ka, kb, ab, ldab, bb, ldbb, w, z, ldz, work, lwork, iwork, liwork, info) |
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| | la_ssbgvd |
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SBGVD: computes all the eigenvalues, and optionally, the eigenvectors of a real generalized symmetric-definite banded eigenproblem, of the form A*x=(lambda)*B*x. Here A and B are assumed to be symmetric and banded, and B is also positive definite. If eigenvectors are desired, it uses a divide and conquer algorithm. The divide and conquer algorithm makes very mild assumptions about floating point arithmetic. It will work on machines with a guard digit in add/subtract, or on those binary machines without guard digits which subtract like the Cray X-MP, Cray Y-MP, Cray C-90, or Cray-2. It could conceivably fail on hexadecimal or decimal machines without guard digits, but we know of none.
◆ dsbgvd()
| pure subroutine la_lapack::sbgvd::dsbgvd |
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character, intent(in) | jobz, |
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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(inout) | bb, |
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integer(ilp), intent(in) | ldbb, |
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real(dp), dimension(*), intent(out) | w, |
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real(dp), dimension(ldz,*), intent(out) | z, |
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integer(ilp), intent(in) | ldz, |
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real(dp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), dimension(*), intent(out) | iwork, |
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integer(ilp), intent(in) | liwork, |
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integer(ilp), intent(out) | info ) |
◆ la_dsbgvd()
| la_lapack::sbgvd::la_dsbgvd |
◆ la_qsbgvd()
| la_lapack::sbgvd::la_qsbgvd |
◆ la_ssbgvd()
| la_lapack::sbgvd::la_ssbgvd |
◆ ssbgvd()
| pure subroutine la_lapack::sbgvd::ssbgvd |
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character, intent(in) | jobz, |
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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(inout) | bb, |
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integer(ilp), intent(in) | ldbb, |
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real(sp), dimension(*), intent(out) | w, |
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real(sp), dimension(ldz,*), intent(out) | z, |
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integer(ilp), intent(in) | ldz, |
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real(sp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), dimension(*), intent(out) | iwork, |
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integer(ilp), intent(in) | liwork, |
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integer(ilp), intent(out) | info ) |
The documentation for this interface was generated from the following file:
