nullevels.wst           package:wavethresh           R Documentation

_S_e_t_s _w_h_o_l_e _r_e_s_o_l_u_t_i_o_n _l_e_v_e_l_s _o_f _c_o_e_f_f_i_c_i_e_n_t_s _e_q_u_a_l _t_o _z_e_r_o _i_n _a _w_s_t _o_b_j_e_c_t.

_D_e_s_c_r_i_p_t_i_o_n:

     Sets whole resolution levels of coefficients equal to zero in a
     'wd' object.

_U_s_a_g_e:

     nullevels.wst(wst, levelstonull, ...)

_A_r_g_u_m_e_n_t_s:

     wst: An object of class 'wst'.

levelstonull: An integer vector specifying which resolution levels of
          coefficients of 'wst' that you wish to set to zero. 

     ...: any other arguments

_D_e_t_a_i_l_s:

     Setting whole resolution levels of coefficients to zero can be
     very useful. For example, one can construct a linear smoothing
     method by setting all coefficients above a particular resolution
     (the _primary resolution_ equal to zero. Also setting particular
     levels equal to zero can also be useful for removing noise which
     is specific to a particular resolution level (as long as important
     signal is not also contained at that level). 

     To remove individual coefficients on a systematic basis you
     probably want to look at the 'threshold' function.

_V_a_l_u_e:

     An object of class 'wst' where the coefficients in resolution
     levels specified by 'levelstonull' have been set to zero.

_R_E_L_E_A_S_E:

     Version 3.8.1 Copyright Guy Nason 1997

_S_e_e _A_l_s_o:

     'nullevels', 'wst', 'wst.object', 'threshold'.

_E_x_a_m_p_l_e_s:

     #
     # Look at the example for this-is-escaped-code{
     # The operation is almost identical except that this-is-escaped-codenormal-bracket41bracket-normal
     # objects are replaced by this-is-escaped-codenormal-bracket43bracket-normal ones. 

