PLASMA  2.8.0
PLASMA - Parallel Linear Algebra for Scalable Multi-core Architectures
int PLASMA_cposv ( PLASMA_enum  uplo,
int  N,
int  NRHS,
PLASMA_Complex32_t *  A,
int  LDA,
PLASMA_Complex32_t *  B,
int  LDB 
)

PLASMA_cposv - Computes the solution to a system of linear equations A * X = B, where A is an N-by-N symmetric positive definite (or Hermitian positive definite in the complex case) matrix and X and B are N-by-NRHS matrices. The Cholesky decomposition is used to factor A as

\[ A = \{_{L\times L^H, if uplo = PlasmaLower}^{U^H\times U, if uplo = PlasmaUpper} \]

where U is an upper triangular matrix and L is a lower triangular matrix. The factored form of A is then used to solve the system of equations A * X = B.

Parameters
[in]uploSpecifies whether the matrix A is upper triangular or lower triangular: = PlasmaUpper: Upper triangle of A is stored; = PlasmaLower: Lower triangle of A is stored.
[in]NThe number of linear equations, i.e., the order of the matrix A. N >= 0.
[in]NRHSThe number of right hand sides, i.e., the number of columns of the matrix B. NRHS >= 0.
[in,out]AOn entry, the symmetric positive definite (or Hermitian) matrix A. If uplo = PlasmaUpper, the leading N-by-N upper triangular part of A contains the upper triangular part of the matrix A, and the strictly lower triangular part of A is not referenced. If UPLO = 'L', the leading N-by-N lower triangular part of A contains the lower triangular part of the matrix A, and the strictly upper triangular part of A is not referenced. On exit, if return value = 0, the factor U or L from the Cholesky factorization A = U**H*U or A = L*L**H.
[in]LDAThe leading dimension of the array A. LDA >= max(1,N).
[in,out]BOn entry, the N-by-NRHS right hand side matrix B. On exit, if return value = 0, the N-by-NRHS solution matrix X.
[in]LDBThe leading dimension of the array B. LDB >= max(1,N).
Returns
Return values
PLASMA_SUCCESSsuccessful exit
<0if -i, the i-th argument had an illegal value
>0if i, the leading minor of order i of A is not positive definite, so the factorization could not be completed, and the solution has not been computed.
See also
PLASMA_cposv_Tile
PLASMA_cposv_Tile_Async
PLASMA_cposv
PLASMA_dposv
PLASMA_sposv