SPEVD: computes all the eigenvalues and, optionally, eigenvectors of a real symmetric matrix A in packed storage. 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 | dspevd (jobz, uplo, n, ap, w, z, ldz, work, lwork, iwork, liwork, info) |
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| | la_dspevd |
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| | la_qspevd |
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| subroutine | sspevd (jobz, uplo, n, ap, w, z, ldz, work, lwork, iwork, liwork, info) |
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| | la_sspevd |
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SPEVD: computes all the eigenvalues and, optionally, eigenvectors of a real symmetric matrix A in packed storage. 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.
◆ dspevd()
| subroutine la_lapack::spevd::dspevd |
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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(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_dspevd()
| la_lapack::spevd::la_dspevd |
◆ la_qspevd()
| la_lapack::spevd::la_qspevd |
◆ la_sspevd()
| la_lapack::spevd::la_sspevd |
◆ sspevd()
| subroutine la_lapack::spevd::sspevd |
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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(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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) |
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The documentation for this interface was generated from the following file:
1.9.8