hopkins                package:spdep                R Documentation

_H_o_p_k_i_n_s _b_u_r_n_t _s_a_v_a_n_n_a _h_e_r_b _r_e_m_a_i_n_s

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

     A 20m square is divided into 40 by 40 0.5m quadrats. Observations
     are in tens of grams of herb remains, 0 being from 0g to less than
     10g, and so on. Analysis was mostly conducted using the interior
     32 by 32 grid.

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

     data(hopkins)

_F_o_r_m_a_t:

     The format is: num [1:40, 1:40] 0 0 0 0 0 0 0 0 0 1 ...

_S_o_u_r_c_e:

     Upton, G., Fingleton, B. 1985 Spatial data analysis by example:
     point pattern and quatitative data, Wiley, pp. 38-39.

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

     Hopkins, B., 1965 Observations on savanna burning in the Olokemeji
     Forest Reserve, Nigeria. Journal of Applied Ecology, 2, 367-381.

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

     data(hopkins)
     image(1:32, 1:32, hopkins[5:36,36:5], breaks=c(-0.5, 3.5, 20),
      col=c("white", "black"))
     box()

