FLA_UDdate_UT_blk_var2.c File Reference

(r)

Functions
FLA_Error	FLA_UDdate_UT_blk_var2 (FLA_Obj R, FLA_Obj C, FLA_Obj D, FLA_Obj T, fla_uddateut_t *cntl)

Function Documentation

FLA_UDdate_UT_blk_var2()

FLA_Error FLA_UDdate_UT_blk_var2	(	FLA_Obj	R,
		FLA_Obj	C,
		FLA_Obj	D,
		FLA_Obj	T,
		fla_uddateut_t *	cntl )

{
  FLA_Obj CT,              C0,
          CB,              C1,
                           C2;
 
  FLA_Obj DT,              D0,
          DB,              D1,
                           D2;
 
  FLA_Obj TT,              T0,
          TB,              T1,
                           T2;
 
  dim_t   b_C, b_D, b_T;
 
  FLA_Part_2x1( C,    &CT, 
                      &CB,            0, FLA_TOP );
 
  FLA_Part_2x1( D,    &DT, 
                      &DB,            0, FLA_TOP );
 
  FLA_Part_2x1( T,    &TT, 
                      &TB,            0, FLA_TOP );
 
  while ( FLA_Obj_length( CT ) < FLA_Obj_length( C ) &&
          FLA_Obj_length( DT ) < FLA_Obj_length( D ) ){
 
    b_C = FLA_Determine_blocksize( CB, FLA_BOTTOM, FLA_Cntl_blocksize( cntl ) );
    b_D = FLA_Determine_blocksize( DB, FLA_BOTTOM, FLA_Cntl_blocksize( cntl ) );
    b_T = FLA_Determine_blocksize( TB, FLA_BOTTOM, FLA_Cntl_blocksize( cntl ) );
 
    FLA_Repart_2x1_to_3x1( CT,                &C0, 
                        /* ** */          /* ****** */
                                              &C1, 
                           CB,                &C2,        b_C, FLA_BOTTOM );
 
    FLA_Repart_2x1_to_3x1( DT,                &D0, 
                        /* ** */          /* ****** */
                                              &D1, 
                           DB,                &D2,        b_D, FLA_BOTTOM );
 
    FLA_Repart_2x1_to_3x1( TT,                &T0, 
                        /* ** */          /* ****** */
                                              &T1, 
                           TB,                &T2,        b_T, FLA_BOTTOM );
 
    /*------------------------------------------------------------*/
 
    /*
       Perform an up/downdate of the upper triangular Cholesky factor R via
       "UD" UT Householder transformations:
 
         [ R, ...
           C1, ...
           D1, T1 ] = FLA_UDdate_UT( R, ...
                                     C1, ...
                                     D1, T1 );
 
       by updating R in such a way that removes the contributions of the rows
       in D1 while simultaneously adding new contributions to the factorization
       from the rows of C1. Note that C1 and D1 are also updated in the process.
       Also note that either C1 or D1 may become empty at any iteration.
    */
 
    FLA_UDdate_UT_internal( R,
                            C1,
                            D1, T1,
                            FLA_Cntl_sub_uddateut( cntl ) );
 
    /*------------------------------------------------------------*/
 
    FLA_Cont_with_3x1_to_2x1( &CT,                C0, 
                                                  C1, 
                            /* ** */          /* ****** */
                              &CB,                C2,     FLA_TOP );
 
    FLA_Cont_with_3x1_to_2x1( &DT,                D0, 
                                                  D1, 
                            /* ** */          /* ****** */
                              &DB,                D2,     FLA_TOP );
 
    FLA_Cont_with_3x1_to_2x1( &TT,                T0, 
                                                  T1, 
                            /* ** */          /* ****** */
                              &TB,                T2,     FLA_TOP );
  }
 
  return FLA_SUCCESS;
}

References FLA_Cont_with_3x1_to_2x1(), FLA_Determine_blocksize(), FLA_Obj_length(), FLA_Part_2x1(), FLA_Repart_2x1_to_3x1(), and FLA_UDdate_UT_internal().

Referenced by FLA_UDdate_UT_internal().