FLA_Apply_H2_UT_l_unb_var1.c File Reference

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Functions
FLA_Error	FLA_Apply_H2_UT_l_unb_var1 (FLA_Obj tau, FLA_Obj u2, FLA_Obj a1t, FLA_Obj A2)

---

Function Documentation

FLA_Error FLA_Apply_H2_UT_l_unb_var1	(	FLA_Obj	tau,
		FLA_Obj	u2,
		FLA_Obj	a1t,
		FLA_Obj	A2
	)

References FLA_Axpy_external(), FLA_Copy_external(), FLA_Gemvc_external(), FLA_Ger_external(), FLA_Inv_scalc_external(), FLA_MINUS_ONE, FLA_Obj_create_conf_to(), FLA_Obj_free(), FLA_Obj_has_zero_dim(), and FLA_ONE.

{
  FLA_Obj w1t;

  if ( FLA_Obj_has_zero_dim( a1t ) ) return FLA_SUCCESS;

  // w1t = a1t;
  FLA_Obj_create_conf_to( FLA_NO_TRANSPOSE, a1t, &w1t );
  FLA_Copy_external( a1t, w1t );

  // w1t = w1t + u2' * A2;
  // w1t = w1t + A2^T * conj(u2);
  FLA_Gemvc_external( FLA_TRANSPOSE, FLA_CONJUGATE, FLA_ONE, A2, u2, FLA_ONE, w1t );

  // w1t = w1t / tau;
  FLA_Inv_scalc_external( FLA_NO_CONJUGATE, tau, w1t );

  // a1t = a1t - w1t;
  FLA_Axpy_external( FLA_MINUS_ONE, w1t, a1t );

  // A2 = A2 - u2 * w1t;
  FLA_Ger_external( FLA_MINUS_ONE, u2, w1t, A2 );

  FLA_Obj_free( &w1t );

  return FLA_SUCCESS;
}