C++ (Cpp) FLA_Her_external Examples

Example #1

File: FLA_Herk_un_unb_var5.c Project: pgawron/tlash

FLA_Error FLA_Herk_un_unb_var5( FLA_Obj alpha, FLA_Obj A, FLA_Obj beta, FLA_Obj C )
{
  FLA_Obj AL,    AR,       A0,  a1,  A2;

  FLA_Scalr_external( FLA_UPPER_TRIANGULAR, beta, C );

  FLA_Part_1x2( A,    &AL,  &AR,      0, FLA_LEFT );

  while ( FLA_Obj_width( AL ) < FLA_Obj_width( A ) ){

    FLA_Repart_1x2_to_1x3( AL,  /**/ AR,        &A0, /**/ &a1, &A2,
                           1, FLA_RIGHT );

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

    /* C := C + a1 * a1' */ 
    FLA_Her_external( FLA_UPPER_TRIANGULAR, alpha, a1, C );

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

    FLA_Cont_with_1x3_to_1x2( &AL,  /**/ &AR,        A0, a1, /**/ A2,
                              FLA_LEFT );

  }

  return FLA_SUCCESS;
}

Example #2

File: FLA_Chol_l_unb_var3.c Project: anaptyxis/libflame

FLA_Error FLA_Chol_l_unb_var3( FLA_Obj A )
{
  FLA_Obj ATL,   ATR,      A00,  a01,     A02,
          ABL,   ABR,      a10t, alpha11, a12t,
                           A20,  a21,     A22;

  int r_val = FLA_SUCCESS;

  FLA_Part_2x2( A,    &ATL, &ATR,
                      &ABL, &ABR,     0, 0, FLA_TL );

  while ( FLA_Obj_length( ATL ) < FLA_Obj_length( A ) ){

    FLA_Repart_2x2_to_3x3( ATL, /**/ ATR,       &A00,  /**/ &a01,     &A02,
                        /* ************* */   /* ************************** */
                                                &a10t, /**/ &alpha11, &a12t,
                           ABL, /**/ ABR,       &A20,  /**/ &a21,     &A22,
                           1, 1, FLA_BR );

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

    // alpha11 = sqrt( alpha11 )
    r_val = FLA_Sqrt( alpha11 );

    if ( r_val != FLA_SUCCESS )
      return ( FLA_Obj_length( A00 ) );

    // a21 = a21 / alpha11
    FLA_Inv_scal_external( alpha11, a21 );

    // A22 = A22 - a21 * a21'
    FLA_Her_external( FLA_LOWER_TRIANGULAR, FLA_MINUS_ONE, a21, A22 );

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

    FLA_Cont_with_3x3_to_2x2( &ATL, /**/ &ATR,       A00,  a01,     /**/ A02,
                                                     a10t, alpha11, /**/ a12t,
                            /* ************** */  /* ************************ */
                              &ABL, /**/ &ABR,       A20,  a21,     /**/ A22,
                              FLA_TL );
  }

  return r_val;
}