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| int PLASMA_dsyev |
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PLASMA_enum |
jobz, |
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PLASMA_enum |
uplo, |
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int |
N, |
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double * |
A, |
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int |
LDA, |
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double * |
W, |
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PLASMA_desc * |
descT, |
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double * |
Q, |
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int |
LDQ |
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) |
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PLASMA_dsyev - Computes all eigenvalues and, optionally, eigenvectors of a complex Hermitian matrix A. The matrix A is preliminary reduced to tridiagonal form using a two-stage approach: First stage: reduction to band tridiagonal form; Second stage: reduction from band to tridiagonal form.
- Parameters
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| [in] | jobz | Intended usage: = PlasmaNoVec: computes eigenvalues only; = PlasmaVec: computes eigenvalues and eigenvectors. |
| [in] | uplo | Specifies 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] | N | The order of the matrix A. N >= 0. |
| [in,out] | A | On entry, the symmetric (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 = PlasmaLower, 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, the lower triangle (if uplo = PlasmaLower) or the upper triangle (if uplo = PlasmaUpper) of A, including the diagonal, is destroyed. |
| [in] | LDA | The leading dimension of the array A. LDA >= max(1,N). |
| [out] | W | On exit, if info = 0, the eigenvalues. |
| [in,out] | descT | On entry, descriptor as return by PLASMA_Alloc_Workspace_dsyev On exit, contains auxiliary factorization data. |
| [out] | Q | On exit, if jobz = PlasmaVec and info = 0, the eigenvectors. |
| [in] | LDQ | The leading dimension of the array Q. LDQ >= max(1,N). |
- Returns
- Return values
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| PLASMA_SUCCESS | successful exit |
| <0 | if -i, the i-th argument had an illegal value |
| >0 | if INFO = i, the algorithm failed to converge; i off-diagonal elements of an intermediate tridiagonal form did not converge to zero. |
- See Also
- PLASMA_dsyev_Tile
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PLASMA_dsyev_Tile_Async
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PLASMA_cheev
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PLASMA_dsyev
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PLASMA_ssyev
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