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LAPACK
3.7.0
LAPACK: Linear Algebra PACKage
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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
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.
[in] | 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 |
[in] | N | N is INTEGER The number of rows and columns of the matrix A. N >= 0. |
[in] | NRHS | NRHS is INTEGER The number of columns of B, the matrix of right hand sides. NRHS >= 0. |
[in] | A | A is COMPLEX*16 array, dimension (N*(N+1)/2) The original complex symmetric matrix A, stored as a packed triangular matrix. |
[in] | X | X is COMPLEX*16 array, dimension (LDX,NRHS) The computed solution vectors for the system of linear equations. |
[in] | LDX | LDX is INTEGER The leading dimension of the array X. LDX >= max(1,N). |
[in,out] | 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. |
[in] | LDB | LDB is INTEGER The leading dimension of the array B. LDB >= max(1,N). |
[out] | RWORK | RWORK is DOUBLE PRECISION array, dimension (N) |
[out] | RESID | RESID is DOUBLE PRECISION The maximum over the number of right hand sides of norm(B - A*X) / ( norm(A) * norm(X) * EPS ). |
Definition at line 125 of file zspt02.f.