FLA_CAQR_UT_inc_init_structure.c File Reference

(r)

Functions
void	FLA_CAQR_UT_inc_init_structure (dim_t p, dim_t nb_part, FLA_Obj R)

---

Function Documentation

void FLA_CAQR_UT_inc_init_structure	(	dim_t	p,
		dim_t	nb_part,
		FLA_Obj	R
	)

References FLA_Obj_view::base, FLA_Obj_buffer_at_view(), FLA_Obj_col_stride(), FLA_Obj_length(), FLA_Obj_row_stride(), FLA_Obj_width(), and FLA_Obj_struct::uplo.

Referenced by FLASH_CAQR_UT_inc_create_hier_matrices().

{
    dim_t    m, n;
    dim_t    rs, cs;
    dim_t    i, j, ip;
    FLA_Obj* buff_R;

    m      = FLA_Obj_length( R );
    n      = FLA_Obj_width( R );
    rs     = FLA_Obj_row_stride( R );
    cs     = FLA_Obj_col_stride( R );
    buff_R = FLA_Obj_buffer_at_view( R );

    // Fill in R by row panels.
    for ( ip = 0; ip < p; ++ip )
    {
        FLA_Obj* buff_R1 = buff_R + (ip*nb_part)*rs;

        int  m_behind   = ip*nb_part;
        int  m_ahead    = m - m_behind;

        int  m_cur      = min( nb_part, m_ahead );
        int  n_cur      = n;

        // Iterate across columns for the current panel.
        for ( j = 0; j < n_cur; ++j )
        {
            FLA_Obj* rho = buff_R1 + j*cs;

            // Mark the above-diagonal blocks as full.
            for ( i = 0; i < j; ++i )
            {
                rho->base->uplo = FLA_FULL_MATRIX;
                rho += rs;
            }

            // Mark the diagonal block as triangular.
            rho->base->uplo = FLA_UPPER_TRIANGULAR;
            rho += rs;
            
            // Mark the below-diagonal blocks as zero.
            for ( i = j + 1; i < m_cur; ++i )
            {
                rho->base->uplo = FLA_ZERO_MATRIX;
                rho += rs;
            }
        }
    }
}