1. Manuals
  2. Tumbleweed
  3. lapack-man
  4. DGET04(3)

Scroll to navigation

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dget04.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dget04.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dget04.f

SYNOPSIS

Functions/Subroutines


subroutine DGET04 (n, nrhs, x, ldx, xact, ldxact, rcond, resid)
DGET04

Function/Subroutine Documentation

subroutine DGET04 (integer n, integer nrhs, double precision, dimension( ldx, * ) x, integer ldx, double precision, dimension( ldxact, * ) xact, integer ldxact, double precision rcond, double precision resid)

DGET04

Purpose:

!>
!> DGET04 computes the difference between a computed solution and the
!> true solution to a system of linear equations.
!>
!> RESID =  ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS ),
!> where RCOND is the reciprocal of the condition number and EPS is the
!> machine epsilon.
!>

Parameters

N 

!>          N is INTEGER
!>          The number of rows of the matrices X and XACT.  N >= 0.
!>

NRHS

!>          NRHS is INTEGER
!>          The number of columns of the matrices X and XACT.  NRHS >= 0.
!>

X

!>          X is DOUBLE PRECISION array, dimension (LDX,NRHS)
!>          The computed solution vectors.  Each vector is stored as a
!>          column of the matrix X.
!>

LDX

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

XACT

!>          XACT is DOUBLE PRECISION array, dimension( LDX, NRHS )
!>          The exact solution vectors.  Each vector is stored as a
!>          column of the matrix XACT.
!>

LDXACT

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

RCOND

!>          RCOND is DOUBLE PRECISION
!>          The reciprocal of the condition number of the coefficient
!>          matrix in the system of equations.
!>

RESID

!>          RESID is DOUBLE PRECISION
!>          The maximum over the NRHS solution vectors of
!>          ( norm(X-XACT) * RCOND ) / ( norm(XACT) * EPS )
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 101 of file dget04.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.

Version 3.12.0 LAPACK