table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dppt02.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dppt02.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dppt02.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine DPPT02 (uplo, n, nrhs, a, x, ldx, b, ldb, rwork,
resid)
DPPT02
Function/Subroutine Documentation¶
subroutine DPPT02 (character uplo, integer n, integer nrhs, double precision, dimension( * ) a, double precision, dimension( ldx, * ) x, integer ldx, double precision, dimension( ldb, * ) b, integer ldb, double precision, dimension( * ) rwork, double precision resid)¶
DPPT02
Purpose:
!> !> DPPT02 computes the residual in the solution of a symmetric system !> of linear equations A*x = b when packed storage is used for the !> coefficient matrix. The ratio computed is !> !> RESID = norm(B - A*X) / ( norm(A) * norm(X) * EPS), !> !> where EPS is the machine precision. !>
Parameters
UPLO
!> UPLO is CHARACTER*1 !> Specifies whether the upper or lower triangular part of the !> symmetric matrix A is stored: !> = 'U': Upper triangular !> = 'L': Lower triangular !>
N
!> N is INTEGER !> The number of rows and columns of the matrix A. N >= 0. !>
NRHS
!> NRHS is INTEGER !> The number of columns of B, the matrix of right hand sides. !> NRHS >= 0. !>
A
!> A is DOUBLE PRECISION array, dimension (N*(N+1)/2) !> The original symmetric matrix A, stored as a packed !> triangular matrix. !>
X
!> X is DOUBLE PRECISION array, dimension (LDX,NRHS) !> The computed solution vectors for the system of linear !> equations. !>
LDX
!> LDX is INTEGER !> The leading dimension of the array X. LDX >= max(1,N). !>
B
!> B is DOUBLE PRECISION array, dimension (LDB,NRHS) !> On entry, the right hand side vectors for the system of !> linear equations. !> On exit, B is overwritten with the difference B - A*X. !>
LDB
!> LDB is INTEGER !> The leading dimension of the array B. LDB >= max(1,N). !>
RWORK
!> RWORK is DOUBLE PRECISION array, dimension (N) !>
RESID
!> RESID is DOUBLE PRECISION !> The maximum over the number of right hand sides of !> norm(B - A*X) / ( norm(A) * norm(X) * EPS ). !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 120 of file dppt02.f.
Author¶
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Version 3.12.0 | LAPACK |