disto                package:pastecs                R Documentation

_C_o_m_p_u_t_e _a_n_d _p_l_o_t _a _d_i_s_t_o_g_r_a_m

_D_e_s_c_r_i_p_t_i_o_n:

     A distogram is an extension of the variogram to a multivariate
     time-series. It computes, for each observation (with a constant
     interval h between each observation), the euclidean distance
     normated to one (chord distance)

_U_s_a_g_e:

     disto(x, max.dist=nrow(x)/4, plotit=TRUE, disto.data=NULL)

_A_r_g_u_m_e_n_t_s:

       x: a matrix, a data frame or a multiple time-series 

max.dist: the maximum distance to calculate. By default, it is the
          third of the number of observations (that is, the number of
          rows in the matrix) 

  plotit: If 'plotit=TRUE' then the graph of the distogram is plotted 

disto.data: data coming from a previous call to 'disto()'. Call the
          function again with these data to plot the corresponding
          graph 

_V_a_l_u_e:

     A data frame containing distance and distogram values

_A_u_t_h_o_r(_s):

     Frdric Ibanez (ibanez@obs-vlfr.fr), Philippe Grosjean
     (phgrosjean@sciviews.org)

_R_e_f_e_r_e_n_c_e_s:

     Dauvin, J.C. & F. Ibanez, 1986. _Variations  long-terme
     (1977-1985) du peuplement des sables fins de la Pierre Noire (baie
     de Morlaix, Manche Occidentale): analyse statistique de
     l'volution structurale._ Hydrobiologia, 142:171-186.

     Ibanez, F. & J.C. Dauvin, 1988. _Long-term changes (1977-1987) in
     a muddy fine sand Abra alba - Melinna palmate community from the
     Western English Channel: multivariate time-series analysis._ Mar.
     Ecol. Prog. Ser., 49:65-81.

     Mackas, D.L., 1984. _Spatial autocorrelation of plankton community
     composition in a continental shelf ecosystem._ Limnol. Ecol.,
     20:451-471.

_S_e_e _A_l_s_o:

     'vario'

_E_x_a_m_p_l_e_s:

     data(bnr)
     disto(bnr)

