FLA_CAQR_UT_inc_factorize_panels.c File Reference

(r)

Functions
FLA_Error	FLA_CAQR_UT_inc_factorize_panels (dim_t nb_part, FLA_Obj A, FLA_Obj TW)

---

Function Documentation

FLA_Error FLA_CAQR_UT_inc_factorize_panels	(	dim_t	nb_part,
		FLA_Obj	A,
		FLA_Obj	TW
	)

References FLA_Cont_with_3x1_to_2x1(), FLA_Obj_length(), FLA_Part_2x1(), FLA_Repart_2x1_to_3x1(), and FLASH_QR_UT_inc().

Referenced by FLASH_CAQR_UT_inc_noopt().

{
  FLA_Obj AT,              A0, 
          AB,              A1,
                           A2;

  FLA_Obj TWT,             TW0, 
          TWB,             TW1,
                           TW2;

  dim_t b;

  FLA_Part_2x1( A,    &AT, 
                      &AB,            0, FLA_TOP );

  FLA_Part_2x1( TW,   &TWT, 
                      &TWB,           0, FLA_TOP );

  while ( FLA_Obj_length( AB ) > 0 ){

    b = min( nb_part, FLA_Obj_length( AB ) );

    FLA_Repart_2x1_to_3x1( AT,                &A0, 
                        /* ** */            /* ** */
                                              &A1, 
                           AB,                &A2,        b, FLA_BOTTOM );

    FLA_Repart_2x1_to_3x1( TWT,               &TW0, 
                        /* ** */            /* ** */
                                              &TW1, 
                           TWB,               &TW2,       b, FLA_BOTTOM );

    /*------------------------------------------------------------*/

    // Perform an incremental QR factorization on A1, writing triangular
    // block Householder factors to T in TW1.
    FLASH_QR_UT_inc( A1, TW1 );

    /*------------------------------------------------------------*/

    FLA_Cont_with_3x1_to_2x1( &AT,               A0, 
                                                 A1, 
                            /* ** */          /* ** */
                              &AB,               A2,      FLA_TOP );

    FLA_Cont_with_3x1_to_2x1( &TWT,              TW0, 
                                                 TW1, 
                            /* ** */          /* ** */
                              &TWB,              TW2,     FLA_TOP );
  }

  return FLA_SUCCESS;
}