cspt02.f - Man Page
TESTING/LIN/cspt02.f
Synopsis
Functions/Subroutines
subroutine cspt02 (uplo, n, nrhs, a, x, ldx, b, ldb, rwork, resid)
CSPT02
Function/Subroutine Documentation
subroutine cspt02 (character uplo, integer n, integer nrhs, complex, dimension( * ) a, complex, dimension( ldx, * ) x, integer ldx, complex, dimension( ldb, * ) b, integer ldb, real, dimension( * ) rwork, real resid)
CSPT02
Purpose:
CSPT02 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 array, dimension (N*(N+1)/2) The original complex symmetric matrix A, stored as a packed triangular matrix.
X
X is COMPLEX 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 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 REAL array, dimension (N)
RESID
RESID is REAL 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 cspt02.f.
Author
Generated automatically by Doxygen for LAPACK from the source code.
Referenced By
The man page cspt02(3) is an alias of cspt02.f(3).
Tue Nov 28 2023 12:08:42 Version 3.12.0 LAPACK