.TH "SRC/zlaqz1.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
SRC/zlaqz1.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBzlaqz1\fP (ilq, ilz, k, istartm, istopm, ihi, a, lda, b, ldb, nq, qstart, q, ldq, nz, zstart, z, ldz)"
.br
.RI "\fBZLAQZ1\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine zlaqz1 (logical, intent(in) ilq, logical, intent(in) ilz, integer, intent(in) k, integer, intent(in) istartm, integer, intent(in) istopm, integer, intent(in) ihi, complex*16, dimension( lda, * ) a, integer, intent(in) lda, complex*16, dimension( ldb, * ) b, integer, intent(in) ldb, integer, intent(in) nq, integer, intent(in) qstart, complex*16, dimension( ldq, * ) q, integer, intent(in) ldq, integer, intent(in) nz, integer, intent(in) zstart, complex*16, dimension( ldz, * ) z, integer, intent(in) ldz)"

.PP
\fBZLAQZ1\fP  
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
      ZLAQZ1 chases a 1x1 shift bulge in a matrix pencil down a single position
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\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
\fIK\fP 
.PP
.nf
          K is INTEGER
              Index indicating the position of the bulge\&.
              On entry, the bulge is located in
              (A(k+1,k),B(k+1,k))\&.
              On exit, the bulge is located in
              (A(k+2,k+1),B(k+2,k+1))\&.
.fi
.PP
.br
\fIISTARTM\fP 
.PP
.nf
          ISTARTM is INTEGER
.fi
.PP
.br
\fIISTOPM\fP 
.PP
.nf
          ISTOPM is INTEGER
              Updates to (A,B) are restricted to
              (istartm:k+2,k:istopm)\&. It is assumed
              without checking that istartm <= k+1 and
              k+2 <= istopm
.fi
.PP
.br
\fIIHI\fP 
.PP
.nf
          IHI is INTEGER
.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 A as declared in
              the calling procedure\&.
.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 B as declared in
              the calling procedure\&.
.fi
.PP
.br
\fINQ\fP 
.PP
.nf
          NQ is INTEGER
              The order of the matrix Q
.fi
.PP
.br
\fIQSTART\fP 
.PP
.nf
          QSTART is INTEGER
              Start index of the matrix Q\&. Rotations are applied
              To columns k+2-qStart:k+3-qStart of Q\&.
.fi
.PP
 
.br
\fIQ\fP 
.PP
.nf
          Q is COMPLEX*16 array, dimension (LDQ,NQ)
.fi
.PP
.br
\fILDQ\fP 
.PP
.nf
          LDQ is INTEGER
              The leading dimension of Q as declared in
              the calling procedure\&.
.fi
.PP
.br
\fINZ\fP 
.PP
.nf
          NZ is INTEGER
              The order of the matrix Z
.fi
.PP
.br
\fIZSTART\fP 
.PP
.nf
          ZSTART is INTEGER
              Start index of the matrix Z\&. Rotations are applied
              To columns k+1-qStart:k+2-qStart of Z\&.
.fi
.PP
 
.br
\fIZ\fP 
.PP
.nf
          Z is COMPLEX*16 array, dimension (LDZ,NZ)
.fi
.PP
.br
\fILDZ\fP 
.PP
.nf
          LDZ is INTEGER
              The leading dimension of Q as declared in
              the calling procedure\&.
.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 \fB171\fP of file \fBzlaqz1\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.