SRC/zlaqz3.f(3)            Library Functions Manual            SRC/zlaqz3.f(3)

NAME
       SRC/zlaqz3.f

SYNOPSIS
   Functions/Subroutines
       subroutine zlaqz3 (ilschur, ilq, ilz, n, ilo, ihi, nshifts,
           nblock_desired, alpha, beta, a, lda, b, ldb, q, ldq, z, ldz, qc,
           ldqc, zc, ldzc, work, lwork, info)
           ZLAQZ3

Function/Subroutine Documentation
   subroutine zlaqz3 (logical, intent(in) ilschur, logical, intent(in) ilq,
       logical, intent(in) ilz, integer, intent(in) n, integer, intent(in)
       ilo, integer, intent(in) ihi, integer, intent(in) nshifts, integer,
       intent(in) nblock_desired, complex*16, dimension( * ), intent(inout)
       alpha, complex*16, dimension( * ), intent(inout) beta, complex*16,
       dimension( lda, * ), intent(inout) a, integer, intent(in) lda,
       complex*16, dimension( ldb, * ), intent(inout) b, integer, intent(in)
       ldb, complex*16, dimension( ldq,         * ), intent(inout) q, integer,
       intent(in) ldq, complex*16, dimension( ldz, * ), intent(inout) z,
       integer, intent(in) ldz, complex*16, dimension( ldqc, * ),
       intent(inout) qc, integer, intent(in) ldqc, complex*16, dimension(
       ldzc, * ), intent(inout) zc, integer, intent(in) ldzc, complex*16,
       dimension( * ), intent(inout) work, integer, intent(in) lwork, integer,
       intent(out) info)
       ZLAQZ3

       Purpose:


           !>
           !> ZLAQZ3 Executes a single multishift QZ sweep
           !>

       Parameters
           ILSCHUR

           !>          ILSCHUR is LOGICAL
           !>              Determines whether or not to update the full Schur form
           !>

           ILQ

           !>          ILQ is LOGICAL
           !>              Determines whether or not to update the matrix Q
           !>

           ILZ

           !>          ILZ is LOGICAL
           !>              Determines whether or not to update the matrix Z
           !>

           N

           !>          N is INTEGER
           !>          The order of the matrices A, B, Q, and Z.  N >= 0.
           !>

           ILO

           !>          ILO is INTEGER
           !>

           IHI

           !>          IHI is INTEGER
           !>

           NSHIFTS

           !>          NSHIFTS is INTEGER
           !>          The desired number of shifts to use
           !>

           NBLOCK_DESIRED

           !>          NBLOCK_DESIRED is INTEGER
           !>          The desired size of the computational windows
           !>

           ALPHA

           !>          ALPHA is COMPLEX*16 array. SR contains
           !>          the alpha parts of the shifts to use.
           !>

           BETA

           !>          BETA is COMPLEX*16 array. SS contains
           !>          the scale of the shifts to use.
           !>

           A

           !>          A is COMPLEX*16 array, dimension (LDA, N)
           !>

           LDA

           !>          LDA is INTEGER
           !>          The leading dimension of the array A.  LDA >= max( 1, N ).
           !>

           B

           !>          B is COMPLEX*16 array, dimension (LDB, N)
           !>

           LDB

           !>          LDB is INTEGER
           !>          The leading dimension of the array B.  LDB >= max( 1, N ).
           !>

           Q

           !>          Q is COMPLEX*16 array, dimension (LDQ, N)
           !>

           LDQ

           !>          LDQ is INTEGER
           !>

           Z

           !>          Z is COMPLEX*16 array, dimension (LDZ, N)
           !>

           LDZ

           !>          LDZ is INTEGER
           !>

           QC

           !>          QC is COMPLEX*16 array, dimension (LDQC, NBLOCK_DESIRED)
           !>

           LDQC

           !>          LDQC is INTEGER
           !>

           ZC

           !>          ZC is COMPLEX*16 array, dimension (LDZC, NBLOCK_DESIRED)
           !>

           LDZC

           !>          LDZ is INTEGER
           !>

           WORK

           !>          WORK is COMPLEX*16 array, dimension (MAX(1,LWORK))
           !>          On exit, if INFO >= 0, WORK(1) returns the optimal LWORK.
           !>

           LWORK

           !>          LWORK is INTEGER
           !>          The dimension of the array WORK.  LWORK >= max(1,N).
           !>
           !>          If LWORK = -1, then a workspace query is assumed; the routine
           !>          only calculates the optimal size of the WORK array, returns
           !>          this value as the first entry of the WORK array, and no error
           !>          message related to LWORK is issued by XERBLA.
           !>

           INFO

           !>          INFO is INTEGER
           !>          = 0: successful exit
           !>          < 0: if INFO = -i, the i-th argument had an illegal value
           !>

       Author
           Thijs Steel, KU Leuven

       Date
           May 2020

       Definition at line 204 of file zlaqz3.f.

Author
       Generated automatically by Doxygen for LAPACK from the source code.

LAPACK                          Version 3.12.0                 SRC/zlaqz3.f(3)