TESTING/LIN/zptt01.f(3) | Library Functions Manual | TESTING/LIN/zptt01.f(3) |
NAME
TESTING/LIN/zptt01.f
SYNOPSIS
Functions/Subroutines
subroutine zptt01 (n, d, e, df, ef, work, resid)
ZPTT01
Function/Subroutine Documentation
subroutine zptt01 (integer n, double precision, dimension( * ) d, complex*16, dimension( * ) e, double precision, dimension( * ) df, complex*16, dimension( * ) ef, complex*16, dimension( * ) work, double precision resid)
ZPTT01
Purpose:
ZPTT01 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 COMPLEX*16 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 COMPLEX*16 array, dimension (N-1) The (n-1) subdiagonal elements of the factor L from the L*D*L' factorization of A.
WORK
WORK is COMPLEX*16 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 91 of file zptt01.f.
Author
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