cblas_drotmg(_:_:_:_:_:)

Declaration

func cblas_drotmg(_ D1: UnsafeMutablePointer<Double>, _ D2: UnsafeMutablePointer<Double>, _ B1: UnsafeMutablePointer<Double>, _ B2: Double, _ P: UnsafeMutablePointer<Double>)

Parameters

• D1:

  Scaling factor D1.

• D2:

  Scaling factor D2.

• B1:

  Scaling factor B1.

• B2:

  Scaling factor B2.

• P:

  A 5-element vector:

  P[0]

  Flag value that defines the form of matrix H.

  -2.0: matrix H contains the identity matrix.

  -1.0: matrix H is identical to matrix SH (defined by the remaining values in the vector).

  0.0: H[1,2] and H[2,1] are obtained from matrix SH. The remaining values are both 1.0.

  1.0: H[1,1] and H[2,2] are obtained from matrix SH. H[1,2] is 1.0. H[2,1] is -1.0.

  P[1]

  Contains SH[1,1].

  P[2]

  Contains SH[2,1].

  P[3]

  Contains SH[1,2].

  P[4]

  Contains SH[2,2].

Discussion

The resulting matrix zeroes the second component of the vector (sqrt(D1)*B1, sqrt(SD2)*B2).

See Also

Double-precision float matrix functions

• cblas_dasum(_:_:_:)
• cblas_daxpy(_:_:_:_:_:_:)
• cblas_dcopy(_:_:_:_:_:)
• cblas_dgbmv(_:_:_:_:_:_:_:_:_:_:_:_:_:_:)
• cblas_dgemm(_:_:_:_:_:_:_:_:_:_:_:_:_:_:)
• cblas_dgemv(_:_:_:_:_:_:_:_:_:_:_:_:)
• cblas_dger(_:_:_:_:_:_:_:_:_:_:)
• cblas_dnrm2(_:_:_:)
• cblas_drot(_:_:_:_:_:_:_:)
• cblas_drotg(_:_:_:_:)
• cblas_drotm(_:_:_:_:_:_:)
• cblas_dsbmv(_:_:_:_:_:_:_:_:_:_:_:_:)
• cblas_dscal(_:_:_:_:)
• cblas_dspmv(_:_:_:_:_:_:_:_:_:_:)
• cblas_dspr(_:_:_:_:_:_:_:)