.TH "TESTING/LIN/dqrt17.f" 3 "Version 3.12.0" "LAPACK" \" -*- nroff -*-
.ad l
.nh
.SH NAME
TESTING/LIN/dqrt17.f
.SH SYNOPSIS
.br
.PP
.SS "Functions/Subroutines"

.in +1c
.ti -1c
.RI "double precision function \fBdqrt17\fP (trans, iresid, m, n, nrhs, a, lda, x, ldx, b, ldb, c, work, lwork)"
.br
.RI "\fBDQRT17\fP "
.in -1c
.SH "Function/Subroutine Documentation"
.PP 
.SS "double precision function dqrt17 (character trans, integer iresid, integer m, integer n, integer nrhs, double precision, dimension( lda, * ) a, integer lda, double precision, dimension( ldx, * ) x, integer ldx, double precision, dimension( ldb, * ) b, integer ldb, double precision, dimension( ldb, * ) c, double precision, dimension( lwork ) work, integer lwork)"

.PP
\fBDQRT17\fP 
.PP
\fBPurpose:\fP
.RS 4

.PP
.nf
!>
!> DQRT17 computes the ratio
!>
!>    norm(R**T * op(A)) / ( norm(A) * alpha * max(M,N,NRHS) * EPS ),
!>
!> where R = B - op(A)*X, op(A) is A or A**T, depending on TRANS, EPS
!> is the machine epsilon, and
!>
!>    alpha = norm(B) if IRESID = 1 (zero-residual problem)
!>    alpha = norm(R) if IRESID = 2 (otherwise)\&.
!>
!> The norm used is the 1-norm\&.
!> 
.fi
.PP
 
.RE
.PP
\fBParameters\fP
.RS 4
\fITRANS\fP 
.PP
.nf
!>          TRANS is CHARACTER*1
!>          Specifies whether or not the transpose of A is used\&.
!>          = 'N':  No transpose, op(A) = A\&.
!>          = 'T':  Transpose, op(A) = A**T\&.
!> 
.fi
.PP
.br
\fIIRESID\fP 
.PP
.nf
!>          IRESID is INTEGER
!>          IRESID = 1 indicates zero-residual problem\&.
!>          IRESID = 2 indicates non-zero residual\&.
!> 
.fi
.PP
.br
\fIM\fP 
.PP
.nf
!>          M is INTEGER
!>          The number of rows of the matrix A\&.
!>          If TRANS = 'N', the number of rows of the matrix B\&.
!>          If TRANS = 'T', the number of rows of the matrix X\&.
!> 
.fi
.PP
.br
\fIN\fP 
.PP
.nf
!>          N is INTEGER
!>          The number of columns of the matrix  A\&.
!>          If TRANS = 'N', the number of rows of the matrix X\&.
!>          If TRANS = 'T', the number of rows of the matrix B\&.
!> 
.fi
.PP
.br
\fINRHS\fP 
.PP
.nf
!>          NRHS is INTEGER
!>          The number of columns of the matrices X and B\&.
!> 
.fi
.PP
.br
\fIA\fP 
.PP
.nf
!>          A is DOUBLE PRECISION array, dimension (LDA,N)
!>          The m-by-n matrix A\&.
!> 
.fi
.PP
.br
\fILDA\fP 
.PP
.nf
!>          LDA is INTEGER
!>          The leading dimension of the array A\&. LDA >= M\&.
!> 
.fi
.PP
.br
\fIX\fP 
.PP
.nf
!>          X is DOUBLE PRECISION array, dimension (LDX,NRHS)
!>          If TRANS = 'N', the n-by-nrhs matrix X\&.
!>          If TRANS = 'T', the m-by-nrhs matrix X\&.
!> 
.fi
.PP
.br
\fILDX\fP 
.PP
.nf
!>          LDX is INTEGER
!>          The leading dimension of the array X\&.
!>          If TRANS = 'N', LDX >= N\&.
!>          If TRANS = 'T', LDX >= M\&.
!> 
.fi
.PP
.br
\fIB\fP 
.PP
.nf
!>          B is DOUBLE PRECISION array, dimension (LDB,NRHS)
!>          If TRANS = 'N', the m-by-nrhs matrix B\&.
!>          If TRANS = 'T', the n-by-nrhs matrix B\&.
!> 
.fi
.PP
.br
\fILDB\fP 
.PP
.nf
!>          LDB is INTEGER
!>          The leading dimension of the array B\&.
!>          If TRANS = 'N', LDB >= M\&.
!>          If TRANS = 'T', LDB >= N\&.
!> 
.fi
.PP
.br
\fIC\fP 
.PP
.nf
!>          C is DOUBLE PRECISION array, dimension (LDB,NRHS)
!> 
.fi
.PP
.br
\fIWORK\fP 
.PP
.nf
!>          WORK is DOUBLE PRECISION array, dimension (LWORK)
!> 
.fi
.PP
.br
\fILWORK\fP 
.PP
.nf
!>          LWORK is INTEGER
!>          The length of the array WORK\&.  LWORK >= NRHS*(M+N)\&.
!> 
.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 \fB151\fP of file \fBdqrt17\&.f\fP\&.
.SH "Author"
.PP 
Generated automatically by Doxygen for LAPACK from the source code\&.