FLA_QR_UT_recover_tau.c File Reference

(r)

Functions
FLA_Error	FLA_QR_UT_recover_tau_submatrix (FLA_Obj T, FLA_Obj t)
FLA_Error	FLA_QR_UT_recover_tau (FLA_Obj T, FLA_Obj t)

Function Documentation

FLA_QR_UT_recover_tau()

FLA_Error FLA_QR_UT_recover_tau	(	FLA_Obj	T,
		FLA_Obj	t
	)

{
  FLA_Obj TL,    TR,       T0,  T1,  T2;
 
  FLA_Obj tT,              t0,
          tB,              t1,
                           t2;
 
  dim_t b_alg, b;
 
  if ( FLA_Check_error_level() >= FLA_MIN_ERROR_CHECKING )
    FLA_QR_UT_recover_tau_check( T, t );
 
  b_alg = FLA_Obj_length( T );
 
  FLA_Part_1x2( T,    &TL,  &TR,      0, FLA_LEFT );
 
  FLA_Part_2x1( t,    &tT, 
                      &tB,            0, FLA_TOP );
 
  // T matrix may include workspace; thus, T should not be placed as a loop guard.
  while ( FLA_Obj_length( tB ) > 0 ) {
 
    // The blocksize should be determined that the T matrix is square.
    b = min( FLA_Obj_length( tB ), b_alg );
 
    FLA_Repart_1x2_to_1x3( TL,  /**/ TR,        &T0, /**/ &T1, &T2,
                           b, FLA_RIGHT );
 
    FLA_Repart_2x1_to_3x1( tT,                &t0, 
                        /* ** */            /* ** */
                                              &t1, 
                           tB,                &t2,        b, FLA_BOTTOM );
 
    /*------------------------------------------------------------*/
 
    FLA_QR_UT_recover_tau_submatrix( T1, t1 );
 
    /*------------------------------------------------------------*/
 
    FLA_Cont_with_1x3_to_1x2( &TL,  /**/ &TR,        T0, T1, /**/ T2,
                              FLA_LEFT );
 
    FLA_Cont_with_3x1_to_2x1( &tT,                t0, 
                                                  t1, 
                            /* ** */           /* ** */
                              &tB,                t2,     FLA_TOP );
  }
 
  return FLA_SUCCESS;
}

References FLA_Check_error_level(), FLA_Cont_with_1x3_to_1x2(), FLA_Cont_with_3x1_to_2x1(), FLA_Obj_length(), FLA_Part_1x2(), FLA_Part_2x1(), FLA_QR_UT_recover_tau_check(), FLA_QR_UT_recover_tau_submatrix(), FLA_Repart_1x2_to_1x3(), FLA_Repart_2x1_to_3x1(), and i.

Referenced by FLA_LQ_UT_recover_tau().

FLA_QR_UT_recover_tau_submatrix()

FLA_Error FLA_QR_UT_recover_tau_submatrix	(	FLA_Obj	T,
		FLA_Obj	t
	)

{
  FLA_Obj TTL,   TTR,      T00,  t01,   T02, 
          TBL,   TBR,      t10t, tau11, t12t,
                           T20,  t21,   T22;
 
  FLA_Obj tT,              t0,
          tB,              tau1,
                           t2;
 
 
  FLA_Part_2x2( T,    &TTL, &TTR,
                      &TBL, &TBR,     0, 0, FLA_TL );
 
  FLA_Part_2x1( t,    &tT, 
                      &tB,            0, FLA_TOP );
 
  while ( FLA_Obj_min_dim( TBR ) > 0 ){
 
    FLA_Repart_2x2_to_3x3( TTL, /**/ TTR,       &T00,  /**/ &t01,   &T02,
                        /* ************* */   /* ************************ */
                                                &t10t, /**/ &tau11, &t12t,
                           TBL, /**/ TBR,       &T20,  /**/ &t21,   &T22,
                           1, 1, FLA_BR );
 
    FLA_Repart_2x1_to_3x1( tT,                  &t0, 
                        /* ** */              /* ** */
                                                &tau1, 
                           tB,                  &t2,        1, FLA_BOTTOM );
 
    /*------------------------------------------------------------*/
 
    // tau1 = tau11;
    FLA_Copy_external( tau11, tau1 );
 
    /*------------------------------------------------------------*/
 
    FLA_Cont_with_3x3_to_2x2( &TTL, /**/ &TTR,       T00,  t01,   /**/ T02,
                                                     t10t, tau11, /**/ t12t,
                            /* ************** */  /* ********************** */
                              &TBL, /**/ &TBR,       T20,  t21,   /**/ T22,
                              FLA_TL );
 
    FLA_Cont_with_3x1_to_2x1( &tT,                   t0, 
                                                     tau1, 
                            /* ** */              /* ** */
                              &tB,                   t2,     FLA_TOP );
 
  }
 
  return FLA_SUCCESS;
}

References FLA_Cont_with_3x1_to_2x1(), FLA_Cont_with_3x3_to_2x2(), FLA_Copy_external(), FLA_Obj_min_dim(), FLA_Part_2x1(), FLA_Part_2x2(), FLA_Repart_2x1_to_3x1(), FLA_Repart_2x2_to_3x3(), and i.

Referenced by FLA_QR_UT_recover_tau().