wp.object             package:wavethresh             R Documentation

_W_a_v_e_l_e_t _P_a_c_k_e_t _d_e_c_o_m_p_o_s_i_t_i_o_n _o_b_j_e_c_t_s.

_D_e_s_c_r_i_p_t_i_o_n:

     These are objects of classes 'wp' They represent a decomposition
     of a function with respect to a set of wavelet packet functions.

_D_e_t_a_i_l_s:

     To retain your sanity we recommend that wavelet packets be
     extracted in one of two ways: 

     \textbullet{use 'getpacket.wp' to obtain individual packets.}
     \textbullet{use 'accessD.wp' to obtain all coefficients at a
     particular resolution level.}

     You can obtain the coefficients directly from the 'wp$wp'
     component but you have to understand their organization described
     above.

_V_a_l_u_e:

     The following components must be included in a legitimate `wp'
     object.  

      wp: a matrix containing the wavelet packet coefficients. Each row
          of the matrix contains coefficients with respect to a
          particular resolution level. There are 'nlevels(wp)+1' rows
          in the matrix. Row 'nlevels(wp)+1' (the ``bottom'') row
          contains the ``original'' data used to produce the wavelet
          packet coefficients. Rows 'nlevels'(wp) to row 1 contain
          coefficients at resolution levels 'nlevels(wp)-1' to 0 (so
          the first row contains coefficients at resolution level 0). 

          The columns contain the coefficients with respect to packets.
          A different packet length exists at each resolution level.
          The packet length at resolution level 'i' is given by '2^i'.
          However, the 'getpacket.wp' function should be used to access
          individual packets from a 'wp' object.

 nlevels: The number of levels in the wavelet packet decomposition. If
          you raise 2 to the power of nlevels you get the number of
          data points used in the decomposition. 

  filter: a list containing the details of the filter that did the
          decomposition (equivalent to the return value from the
          'filter.select' function). 

    date: The date that the transform was performed or the wp was
          modified.

_G_E_N_E_R_A_T_I_O_N:

     This class of objects is returned from the 'wp' function to
     represent a wavelet packet decomposition of a function. Many other
     functions return an object of class wp.

_M_E_T_H_O_D_S:

     The wp class of objects has methods for the following generic
     functions: 'InvBasis', 'MaNoVe', 'accessC', 'accessD',
     'basisplot', 'draw'. 'getpacket', 'nlevels', 'plot', 'print',
     'putC', 'putD', 'putpacket', 'summary', 'threshold'.

_R_E_L_E_A_S_E:

     Version 3.5.3 Copyright Guy Nason 1994

_S_e_e _A_l_s_o:

     'wp'

