LAQR0: computes the eigenvalues of a Hessenberg matrix H and, optionally, the matrices T and Z from the Schur decomposition H = Z T Z**H, where T is an upper triangular matrix (the Schur form), and Z is the unitary matrix of Schur vectors. Optionally Z may be postmultiplied into an input unitary matrix Q so that this routine can give the Schur factorization of a matrix A which has been reduced to the Hessenberg form H by the unitary matrix Q: A = Q*H*Q**H = (QZ)*H*(QZ)**H.
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| pure subroutine | claqr0 (wantt, wantz, n, ilo, ihi, h, ldh, w, iloz, ihiz, z, ldz, work, lwork, info) |
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| | la_claqr0 |
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| subroutine | dlaqr0 (wantt, wantz, n, ilo, ihi, h, ldh, wr, wi, iloz, ihiz, z, ldz, work, lwork, info) |
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| | la_dlaqr0 |
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| | la_qlaqr0 |
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| subroutine | slaqr0 (wantt, wantz, n, ilo, ihi, h, ldh, wr, wi, iloz, ihiz, z, ldz, work, lwork, info) |
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| | la_slaqr0 |
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| | la_wlaqr0 |
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| pure subroutine | zlaqr0 (wantt, wantz, n, ilo, ihi, h, ldh, w, iloz, ihiz, z, ldz, work, lwork, info) |
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| | la_zlaqr0 |
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LAQR0: computes the eigenvalues of a Hessenberg matrix H and, optionally, the matrices T and Z from the Schur decomposition H = Z T Z**H, where T is an upper triangular matrix (the Schur form), and Z is the unitary matrix of Schur vectors. Optionally Z may be postmultiplied into an input unitary matrix Q so that this routine can give the Schur factorization of a matrix A which has been reduced to the Hessenberg form H by the unitary matrix Q: A = Q*H*Q**H = (QZ)*H*(QZ)**H.
◆ claqr0()
| pure subroutine la_lapack::laqr0::claqr0 |
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logical(lk), intent(in) | wantt, |
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logical(lk), intent(in) | wantz, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | ilo, |
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integer(ilp), intent(in) | ihi, |
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complex(sp), dimension(ldh,*), intent(inout) | h, |
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integer(ilp), intent(in) | ldh, |
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complex(sp), dimension(*), intent(out) | w, |
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integer(ilp), intent(in) | iloz, |
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integer(ilp), intent(in) | ihiz, |
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complex(sp), dimension(ldz,*), intent(inout) | z, |
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integer(ilp), intent(in) | ldz, |
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complex(sp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), intent(out) | info ) |
◆ dlaqr0()
| subroutine la_lapack::laqr0::dlaqr0 |
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logical(lk), intent(in) | wantt, |
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logical(lk), intent(in) | wantz, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | ilo, |
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integer(ilp), intent(in) | ihi, |
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real(dp), dimension(ldh,*), intent(inout) | h, |
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integer(ilp), intent(in) | ldh, |
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real(dp), dimension(*), intent(out) | wr, |
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real(dp), dimension(*), intent(out) | wi, |
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integer(ilp), intent(in) | iloz, |
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integer(ilp), intent(in) | ihiz, |
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real(dp), dimension(ldz,*), intent(inout) | 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), intent(out) | info ) |
◆ la_claqr0()
| la_lapack::laqr0::la_claqr0 |
◆ la_dlaqr0()
| la_lapack::laqr0::la_dlaqr0 |
◆ la_qlaqr0()
| la_lapack::laqr0::la_qlaqr0 |
◆ la_slaqr0()
| la_lapack::laqr0::la_slaqr0 |
◆ la_wlaqr0()
| la_lapack::laqr0::la_wlaqr0 |
◆ la_zlaqr0()
| la_lapack::laqr0::la_zlaqr0 |
◆ slaqr0()
| subroutine la_lapack::laqr0::slaqr0 |
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logical(lk), intent(in) | wantt, |
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logical(lk), intent(in) | wantz, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | ilo, |
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integer(ilp), intent(in) | ihi, |
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real(sp), dimension(ldh,*), intent(inout) | h, |
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integer(ilp), intent(in) | ldh, |
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real(sp), dimension(*), intent(out) | wr, |
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real(sp), dimension(*), intent(out) | wi, |
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integer(ilp), intent(in) | iloz, |
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integer(ilp), intent(in) | ihiz, |
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real(sp), dimension(ldz,*), intent(inout) | 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), intent(out) | info ) |
◆ zlaqr0()
| pure subroutine la_lapack::laqr0::zlaqr0 |
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logical(lk), intent(in) | wantt, |
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logical(lk), intent(in) | wantz, |
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integer(ilp), intent(in) | n, |
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integer(ilp), intent(in) | ilo, |
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integer(ilp), intent(in) | ihi, |
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complex(dp), dimension(ldh,*), intent(inout) | h, |
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integer(ilp), intent(in) | ldh, |
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complex(dp), dimension(*), intent(out) | w, |
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integer(ilp), intent(in) | iloz, |
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integer(ilp), intent(in) | ihiz, |
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complex(dp), dimension(ldz,*), intent(inout) | z, |
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integer(ilp), intent(in) | ldz, |
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complex(dp), dimension(*), intent(out) | work, |
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integer(ilp), intent(in) | lwork, |
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integer(ilp), intent(out) | info ) |
The documentation for this interface was generated from the following file:
