cblas_drotg(_:_:_:_:)

Declaration

func cblas_drotg(_ A: UnsafeMutablePointer<Double>, _ B: UnsafeMutablePointer<Double>, _ C: UnsafeMutablePointer<Double>, _ S: UnsafeMutablePointer<Double>)

Parameters

• A:

  Double-precision value a. Overwritten on return with result r.

• B:

  Double-precision value b. Overwritten on return with result z (zero).

• C:

  Unused on entry. Overwritten on return with the value cos(θ).

• S:

  Unused on entry. Overwritten on return with the value sin(θ).

Discussion

Given a vertical matrix containing a and b, computes the values of cos θ and sin θ that zero the lower value (b). Returns the value of sin θ in s, the value of cos θ in c, and the upper value (r) in a.

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_drotm(_:_:_:_:_:_:)
• cblas_drotmg(_:_:_:_:_:)
• cblas_dsbmv(_:_:_:_:_:_:_:_:_:_:_:_:)
• cblas_dscal(_:_:_:_:)
• cblas_dspmv(_:_:_:_:_:_:_:_:_:_:)
• cblas_dspr(_:_:_:_:_:_:_:)