PLASMA 2.8.0 PLASMA - Parallel Linear Algebra for Scalable Multi-core Architectures

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void CORE_dlansy | ( | int | norm,
|  | PLASMA_enum | uplo,
|  | int | N,
|  | const double * | A,
|  | int | LDA,
|  | double * | work,
|  | double * | normA
| ) |  |

CORE_dlansy returns the value

dlansy = ( max(abs(A(i,j))), NORM = PlasmaMaxNorm ( ( norm1(A), NORM = PlasmaOneNorm ( ( normI(A), NORM = PlasmaInfNorm ( ( normF(A), NORM = PlasmaFrobeniusNorm

where norm1 denotes the one norm of a matrix (maximum column sum), normI denotes the infinity norm of a matrix (maximum row sum) and normF denotes the Frobenius norm of a matrix (square root of sum of squares). Note that max(abs(A(i,j))) is not a consistent matrix norm.

Parameters

  [in] | norm | = PlasmaMaxNorm: Max norm = PlasmaOneNorm: One norm = PlasmaInfNorm: Infinity norm = PlasmaFrobeniusNorm: Frobenius norm
  [in] | uplo | = PlasmaUpper: Upper triangle of A is stored; = PlasmaLower: Lower triangle of A is stored.
  [in] | N | The number of columns/rows of the matrix A. N >= 0. When N = 0, the returned value is set to zero.
  [in] | A | The N-by-N matrix A.
  [in] | LDA | The leading dimension of the array A. LDA >= max(1,N).
  [in,out] | work | Array of dimension (MAX(1,LWORK)), where LWORK >= N when norm = PlasmaInfNorm or PlasmaOneNorm; otherwise, work is not referenced.
  [out] | normA | On exit, normA is the norm of matrix A.