zspt02.f - Man Page
TESTING/LIN/zspt02.f
Synopsis
Functions/Subroutines
subroutine zspt02 (uplo, n, nrhs, a, x, ldx, b, ldb, rwork, resid)
ZSPT02
Function/Subroutine Documentation
subroutine zspt02 (character uplo, integer n, integer nrhs, complex*16, dimension( * ) a, complex*16, dimension( ldx, * ) x, integer ldx, complex*16, dimension( ldb, * ) b, integer ldb, double precision, dimension( * ) rwork, double precision resid)
ZSPT02
Purpose:
ZSPT02 computes the residual in the solution of a complex 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 complex 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 COMPLEX*16 array, dimension (N*(N+1)/2) The original complex symmetric matrix A, stored as a packed triangular matrix.
X
X is COMPLEX*16 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 COMPLEX*16 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 121 of file zspt02.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Referenced By
The man page zspt02(3) is an alias of zspt02.f(3).
Tue Nov 28 2023 12:08:43 Version 3.12.0 LAPACK