SPGVD: computes all the eigenvalues, and optionally, the eigenvectors of a real generalized symmetric-definite eigenproblem, of the form A*x=(lambda)*B*x, A*Bx=(lambda)*x, or B*A*x=(lambda)*x. Here A and B are assumed to be symmetric, stored in packed format, 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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| subroutine | dspgvd (itype, jobz, uplo, n, ap, bp, w, z, ldz, work, lwork, iwork, liwork, info) |
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| | la_dspgvd |
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| | la_qspgvd |
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| subroutine | sspgvd (itype, jobz, uplo, n, ap, bp, w, z, ldz, work, lwork, iwork, liwork, info) |
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| | la_sspgvd |
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SPGVD: computes all the eigenvalues, and optionally, the eigenvectors of a real generalized symmetric-definite eigenproblem, of the form A*x=(lambda)*B*x, A*Bx=(lambda)*x, or B*A*x=(lambda)*x. Here A and B are assumed to be symmetric, stored in packed format, 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.
◆ dspgvd()
| subroutine la_lapack::spgvd::dspgvd |
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integer(ilp), intent(in) |
itype, |
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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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real(dp), dimension(*), intent(inout) |
ap, |
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real(dp), dimension(*), intent(inout) |
bp, |
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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 |
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◆ la_dspgvd()
| la_lapack::spgvd::la_dspgvd |
◆ la_qspgvd()
| la_lapack::spgvd::la_qspgvd |
◆ la_sspgvd()
| la_lapack::spgvd::la_sspgvd |
◆ sspgvd()
| subroutine la_lapack::spgvd::sspgvd |
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integer(ilp), intent(in) |
itype, |
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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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real(sp), dimension(*), intent(inout) |
ap, |
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real(sp), dimension(*), intent(inout) |
bp, |
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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 |
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The documentation for this interface was generated from the following file:
1.9.8