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/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dptt01.f(3) Library Functions Manual /home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dptt01.f(3)

NAME

/home/abuild/rpmbuild/BUILD/lapack-static-3.12.0-build/lapack-3.12.0/TESTING/LIN/dptt01.f

SYNOPSIS

Functions/Subroutines


subroutine DPTT01 (n, d, e, df, ef, work, resid)
DPTT01

Function/Subroutine Documentation

subroutine DPTT01 (integer n, double precision, dimension( * ) d, double precision, dimension( * ) e, double precision, dimension( * ) df, double precision, dimension( * ) ef, double precision, dimension( * ) work, double precision resid)

DPTT01

Purpose:

!>
!> DPTT01 reconstructs a tridiagonal matrix A from its L*D*L'
!> factorization and computes the residual
!>    norm(L*D*L' - A) / ( n * norm(A) * EPS ),
!> where EPS is the machine epsilon.
!>

Parameters

N 

!>          N is INTEGER
!>          The order of the matrix A.
!>

D

!>          D is DOUBLE PRECISION array, dimension (N)
!>          The n diagonal elements of the tridiagonal matrix A.
!>

E

!>          E is DOUBLE PRECISION array, dimension (N-1)
!>          The (n-1) subdiagonal elements of the tridiagonal matrix A.
!>

DF

!>          DF is DOUBLE PRECISION array, dimension (N)
!>          The n diagonal elements of the factor L from the L*D*L'
!>          factorization of A.
!>

EF

!>          EF is DOUBLE PRECISION array, dimension (N-1)
!>          The (n-1) subdiagonal elements of the factor L from the
!>          L*D*L' factorization of A.
!>

WORK

!>          WORK is DOUBLE PRECISION array, dimension (2*N)
!>

RESID

!>          RESID is DOUBLE PRECISION
!>          norm(L*D*L' - A) / (n * norm(A) * EPS)
!>

Author

Univ. of Tennessee

Univ. of California Berkeley

Univ. of Colorado Denver

NAG Ltd.

Definition at line 90 of file dptt01.f.

Author

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Version 3.12.0 LAPACK