table of contents
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dgtt01.f(3) | Library Functions Manual | /home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dgtt01.f(3) |
NAME¶
/home/abuild/rpmbuild/BUILD/lapack-3.12.0/TESTING/LIN/dgtt01.f
SYNOPSIS¶
Functions/Subroutines¶
subroutine DGTT01 (n, dl, d, du, dlf, df, duf, du2, ipiv,
work, ldwork, rwork, resid)
DGTT01
Function/Subroutine Documentation¶
subroutine DGTT01 (integer n, double precision, dimension( * ) dl, double precision, dimension( * ) d, double precision, dimension( * ) du, double precision, dimension( * ) dlf, double precision, dimension( * ) df, double precision, dimension( * ) duf, double precision, dimension( * ) du2, integer, dimension( * ) ipiv, double precision, dimension( ldwork, * ) work, integer ldwork, double precision, dimension( * ) rwork, double precision resid)¶
DGTT01
Purpose:
!> !> DGTT01 reconstructs a tridiagonal matrix A from its LU factorization !> and computes the residual !> norm(L*U - A) / ( norm(A) * EPS ), !> where EPS is the machine epsilon. !>
Parameters
N
!> N is INTEGER !> The order of the matrix A. N >= 0. !>
DL
!> DL is DOUBLE PRECISION array, dimension (N-1) !> The (n-1) sub-diagonal elements of A. !>
D
!> D is DOUBLE PRECISION array, dimension (N) !> The diagonal elements of A. !>
DU
!> DU is DOUBLE PRECISION array, dimension (N-1) !> The (n-1) super-diagonal elements of A. !>
DLF
!> DLF is DOUBLE PRECISION array, dimension (N-1) !> The (n-1) multipliers that define the matrix L from the !> LU factorization of A. !>
DF
!> DF is DOUBLE PRECISION array, dimension (N) !> The n diagonal elements of the upper triangular matrix U from !> the LU factorization of A. !>
DUF
!> DUF is DOUBLE PRECISION array, dimension (N-1) !> The (n-1) elements of the first super-diagonal of U. !>
DU2
!> DU2 is DOUBLE PRECISION array, dimension (N-2) !> The (n-2) elements of the second super-diagonal of U. !>
IPIV
!> IPIV is INTEGER array, dimension (N) !> The pivot indices; for 1 <= i <= n, row i of the matrix was !> interchanged with row IPIV(i). IPIV(i) will always be either !> i or i+1; IPIV(i) = i indicates a row interchange was not !> required. !>
WORK
!> WORK is DOUBLE PRECISION array, dimension (LDWORK,N) !>
LDWORK
!> LDWORK is INTEGER !> The leading dimension of the array WORK. LDWORK >= max(1,N). !>
RWORK
!> RWORK is DOUBLE PRECISION array, dimension (N) !>
RESID
!> RESID is DOUBLE PRECISION !> The scaled residual: norm(L*U - A) / (norm(A) * EPS) !>
Author
Univ. of Tennessee
Univ. of California Berkeley
Univ. of Colorado Denver
NAG Ltd.
Definition at line 132 of file dgtt01.f.
Author¶
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Version 3.12.0 | LAPACK |