.TH "TESTING/EIG/zhst01.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/EIG/zhst01.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "subroutine \fBzhst01\fP (n, ilo, ihi, a, lda, h, ldh, q, ldq, work, lwork, rwork, result)"
.br
.RI "\fBZHST01\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "subroutine zhst01 (integer n, integer ilo, integer ihi, complex*16, dimension( lda, * ) a, integer lda, complex*16, dimension( ldh, * ) h, integer ldh, complex*16, dimension( ldq, * ) q, integer ldq, complex*16, dimension( lwork ) work, integer lwork, double precision, dimension( * ) rwork, double precision, dimension( 2 ) result)"

.PP
\fBZHST01\fP 
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
!>
!> ZHST01 tests the reduction of a general matrix A to upper Hessenberg
!> form:  A = Q*H*Q'\&.  Two test ratios are computed;
!>
!> RESULT(1) = norm( A - Q*H*Q' ) / ( norm(A) * N * EPS )
!> RESULT(2) = norm( I - Q'*Q ) / ( N * EPS )
!>
!> The matrix Q is assumed to be given explicitly as it would be
!> following ZGEHRD + ZUNGHR\&.
!>
!> In this version, ILO and IHI are not used, but they could be used
!> to save some work if this is desired\&.
!> 
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fIN\fP 
.PP
.nf
!>          N is INTEGER
!>          The order of the matrix A\&.  N >= 0\&.
!> 
.fi
.PP
.br
\fIILO\fP 
.PP
.nf
!>          ILO is INTEGER
!> 
.fi
.PP
.br
\fIIHI\fP 
.PP
.nf
!>          IHI is INTEGER
!>
!>          A is assumed to be upper triangular in rows and columns
!>          1:ILO-1 and IHI+1:N, so Q differs from the identity only in
!>          rows and columns ILO+1:IHI\&.
!> 
.fi
.PP
.br
\fIA\fP 
.PP
.nf
!>          A is COMPLEX*16 array, dimension (LDA,N)
!>          The original n by n matrix A\&.
!> 
.fi
.PP
.br
\fILDA\fP 
.PP
.nf
!>          LDA is INTEGER
!>          The leading dimension of the array A\&.  LDA >= max(1,N)\&.
!> 
.fi
.PP
.br
\fIH\fP 
.PP
.nf
!>          H is COMPLEX*16 array, dimension (LDH,N)
!>          The upper Hessenberg matrix H from the reduction A = Q*H*Q'
!>          as computed by ZGEHRD\&.  H is assumed to be zero below the
!>          first subdiagonal\&.
!> 
.fi
.PP
.br
\fILDH\fP 
.PP
.nf
!>          LDH is INTEGER
!>          The leading dimension of the array H\&.  LDH >= max(1,N)\&.
!> 
.fi
.PP
.br
\fIQ\fP 
.PP
.nf
!>          Q is COMPLEX*16 array, dimension (LDQ,N)
!>          The orthogonal matrix Q from the reduction A = Q*H*Q' as
!>          computed by ZGEHRD + ZUNGHR\&.
!> 
.fi
.PP
.br
\fILDQ\fP 
.PP
.nf
!>          LDQ is INTEGER
!>          The leading dimension of the array Q\&.  LDQ >= max(1,N)\&.
!> 
.fi
.PP
.br
\fIWORK\fP 
.PP
.nf
!>          WORK is COMPLEX*16 array, dimension (LWORK)
!> 
.fi
.PP
.br
\fILWORK\fP 
.PP
.nf
!>          LWORK is INTEGER
!>          The length of the array WORK\&.  LWORK >= 2*N*N\&.
!> 
.fi
.PP
.br
\fIRWORK\fP 
.PP
.nf
!>          RWORK is DOUBLE PRECISION array, dimension (N)
!> 
.fi
.PP
.br
\fIRESULT\fP 
.PP
.nf
!>          RESULT is DOUBLE PRECISION array, dimension (2)
!>          RESULT(1) = norm( A - Q*H*Q' ) / ( norm(A) * N * EPS )
!>          RESULT(2) = norm( I - Q'*Q ) / ( N * EPS )
!> 
.fi
.PP
 
.RE
.PP
\fBAuthor\fP
.RS 4
Univ\&. of Tennessee 

.PP
Univ\&. of California Berkeley 

.PP
Univ\&. of Colorado Denver 

.PP
NAG Ltd\&. 
.RE
.PP

.PP
Definition at line \fB138\fP of file \fBzhst01\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.