.TH "SRC/zlaqz3.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
SRC/zlaqz3.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBzlaqz3\fP (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)"
.br
.RI "\fBZLAQZ3\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "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)"

.PP
\fBZLAQZ3\fP  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
 ZLAQZ3 Executes a single multishift QZ sweep
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIILSCHUR\fP 
.PP
.nf
          ILSCHUR is LOGICAL
              Determines whether or not to update the full Schur form
.fi
.PP
.br
\fIILQ\fP 
.PP
.nf
          ILQ is LOGICAL
              Determines whether or not to update the matrix Q
.fi
.PP
.br
\fIILZ\fP 
.PP
.nf
          ILZ is LOGICAL
              Determines whether or not to update the matrix Z
.fi
.PP
.br
\fIN\fP 
.PP
.nf
          N is INTEGER
          The order of the matrices A, B, Q, and Z\&.  N >= 0\&.
.fi
.PP
.br
\fIILO\fP 
.PP
.nf
          ILO is INTEGER
.fi
.PP
.br
\fIIHI\fP 
.PP
.nf
          IHI is INTEGER
.fi
.PP
.br
\fINSHIFTS\fP 
.PP
.nf
          NSHIFTS is INTEGER
          The desired number of shifts to use
.fi
.PP
.br
\fINBLOCK_DESIRED\fP 
.PP
.nf
          NBLOCK_DESIRED is INTEGER
          The desired size of the computational windows
.fi
.PP
.br
\fIALPHA\fP 
.PP
.nf
          ALPHA is COMPLEX*16 array\&. SR contains
          the alpha parts of the shifts to use\&.
.fi
.PP
.br
\fIBETA\fP 
.PP
.nf
          BETA is COMPLEX*16 array\&. SS contains
          the scale of the shifts to use\&.
.fi
.PP
.br
\fIA\fP 
.PP
.nf
          A is COMPLEX*16 array, dimension (LDA, N)
.fi
.PP
.br
\fILDA\fP 
.PP
.nf
          LDA is INTEGER
          The leading dimension of the array A\&.  LDA >= max( 1, N )\&.
.fi
.PP
.br
\fIB\fP 
.PP
.nf
          B is COMPLEX*16 array, dimension (LDB, N)
.fi
.PP
.br
\fILDB\fP 
.PP
.nf
          LDB is INTEGER
          The leading dimension of the array B\&.  LDB >= max( 1, N )\&.
.fi
.PP
.br
\fIQ\fP 
.PP
.nf
          Q is COMPLEX*16 array, dimension (LDQ, N)
.fi
.PP
.br
\fILDQ\fP 
.PP
.nf
          LDQ is INTEGER
.fi
.PP
.br
\fIZ\fP 
.PP
.nf
          Z is COMPLEX*16 array, dimension (LDZ, N)
.fi
.PP
.br
\fILDZ\fP 
.PP
.nf
          LDZ is INTEGER
.fi
.PP
.br
\fIQC\fP 
.PP
.nf
          QC is COMPLEX*16 array, dimension (LDQC, NBLOCK_DESIRED)
.fi
.PP
.br
\fILDQC\fP 
.PP
.nf
          LDQC is INTEGER
.fi
.PP
.br
\fIZC\fP 
.PP
.nf
          ZC is COMPLEX*16 array, dimension (LDZC, NBLOCK_DESIRED)
.fi
.PP
.br
\fILDZC\fP 
.PP
.nf
          LDZ is INTEGER
.fi
.PP
.br
\fIWORK\fP 
.PP
.nf
          WORK is COMPLEX*16 array, dimension (MAX(1,LWORK))
          On exit, if INFO >= 0, WORK(1) returns the optimal LWORK\&.
.fi
.PP
.br
\fILWORK\fP 
.PP
.nf
          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\&.
.fi
.PP
.br
\fIINFO\fP 
.PP
.nf
          INFO is INTEGER
          = 0: successful exit
          < 0: if INFO = -i, the i-th argument had an illegal value
.fi
.PP
 
.RE
.PP
\fBAuthor\fP
.RS 4
Thijs Steel, KU Leuven 
.RE
.PP
\fBDate\fP
.RS 4
May 2020 
.RE
.PP

.PP
Definition at line \fB204\fP of file \fBzlaqz3\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.