FLA_Tridiag_UT_create_T.c File Reference

(r)

Functions
FLA_Error	FLA_Tridiag_UT_create_T (FLA_Obj A, FLA_Obj *T)

Function Documentation

FLA_Tridiag_UT_create_T()

FLA_Error FLA_Tridiag_UT_create_T	(	FLA_Obj	A,
		FLA_Obj *	T
	)

{
  FLA_Datatype datatype;
  dim_t        b_alg, k;
  dim_t        rs_T, cs_T;
 
  // Query the datatype of A.
  datatype = FLA_Obj_datatype( A );
 
  // Query the blocksize from the library.
  b_alg = FLA_Query_blocksize( datatype, FLA_DIMENSION_MIN );
 
  // Scale the blocksize by a pre-set global constant.
  b_alg = ( dim_t )( ( ( double ) b_alg ) * FLA_TRIDIAG_INNER_TO_OUTER_B_RATIO );
 
  // Query the minimum dimension of A.
  k = FLA_Obj_min_dim( A );
 
  // Adjust the blocksize with respect to the min-dim of A.
  b_alg = min( b_alg, k );
 
  // Figure out whether T should be row-major or column-major.
  if ( FLA_Obj_row_stride( A ) == 1 )
  {
    rs_T = 1;
    cs_T = b_alg;
  }
  else // if ( FLA_Obj_col_stride( A ) == 1 )
  {
    rs_T = k;
    cs_T = 1;
  }
 
  // Create a b_alg x k matrix to hold the block Householder transforms that
  // will be accumulated within the tridiagonal reduction algorithm.
  FLA_Obj_create( datatype, b_alg, k, rs_T, cs_T, T );
 
  return FLA_SUCCESS;
}

References FLA_Obj_create(), FLA_Obj_datatype(), FLA_Obj_min_dim(), FLA_Obj_row_stride(), FLA_Query_blocksize(), and i.

Referenced by FLA_Hevd_lv_unb_var1(), and FLA_Hevd_lv_unb_var2().