filtfft                 package:xcms                 R Documentation

_A_p_p_l_y _a_n _c_o_n_v_o_l_u_t_i_o_n _f_i_l_t_e_r _u_s_i_n_g _a_n _F_F_T

_D_e_s_c_r_i_p_t_i_o_n:

     Expands a vector to the length of the filter and then convolutes
     it using two successive FFTs.

_U_s_a_g_e:

     filtfft(y, filt)

_A_r_g_u_m_e_n_t_s:

       y: numeric vector of data to be filtered

    filt: filter with length 'nextn(length(y))'

_V_a_l_u_e:

     A numeric vector the same length as y.

_A_u_t_h_o_r(_s):

     Colin A. Smith, csmith@scripps.edu

