PLASMA: PLASMA_ssytrd

PLASMA 2.4.6

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PLASMA_ssyev
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PLASMA_ssyr2k
PLASMA_ssyrk
PLASMA_ssytrd
PLASMA_sTile_to_Lapack
PLASMA_strmm
PLASMA_strsm
PLASMA_strsmpl
PLASMA_strsmrv
PLASMA_strtri
int PLASMA_ssytrd | ( | PLASMA_enum | jobz,
|  | PLASMA_enum | uplo,
|  | int | N,
|  | float * | A,
|  | int | LDA,
|  | float * | D,
|  | float * | E,
|  | PLASMA_desc * | descT,
|  | float * | Q,
|  | int | LDQ
| ) |  |
  PLASMA_ssytrd - reduces a complex Hermitian matrix A to real symmetric tridiagonal form S using a two-stage approach First stage: reduction to band tridiagonal form (unitary Q1); Second stage: reduction from band to tridiagonal form (unitary Q2). Let Q = Q1 * Q2 be the global unitary transformation; Q**T * A * Q = S. Parameters
  [in] | jobz | Intended usage: = PlasmaNoVec: computes tridiagonal only; = PlasmaVec: computes tridiagonal and generate the orthogonal matrix Q.
  [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] | D | On exit, the diagonal elements of the tridiagonal matrix: D(i) = A(i,i).
  [out] | E | On exit, he off-diagonal elements of the tridiagonal matrix: E(i) = A(i,i+1) if uplo = PlasmaUpper, E(i) = A(i+1,i) if uplo = PlasmaLower.
  [out] | descT | On entry, descriptor as return by PLASMA_Alloc_Workspace_ssytrd On exit, contains auxiliary factorization data.
  [out] | Q | On exit, if jobz = PlasmaVec, then if return value = 0, Q contains the N-by-N unitary matrix Q. If jobz = PlasmaNoVec, then it is not referenced.
  [in] | LDQ | The leading dimension of the array Q. LDQ >= N.
  Returns Return values
  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_ssytrd_Tile PLASMA_ssytrd_Tile_Async PLASMA_chetrd PLASMA_dsytrd PLASMA_ssytrd