GetPracticalRange        package:RandomFields        R Documentation

_D_e_t_e_r_m_i_n_a_t_i_o_n _o_f _t_h_e _p_r_a_c_t_i_c_a_l _r_a_n_g_e

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

     the function returns the practical range of a covariance model,
     i.e. the distance for which the model with standard parameters
     ('variance=1', 'nugget=0', 'scale=1') values 0.05

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

     GetPracticalRange(model, kappas=NULL)

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

   model: string; covariance model, see 'CovarianceFct', or type
          'PrintModelList()' to get all options.

  kappas: additional parameters of a parametrised model, see
          'CovarianceFct'.

_D_e_t_a_i_l_s:

     In case the practical range has to be determined numerically, only
     a rough approximation is provided.

     The function can only be applied to isotropic models

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

     real number (the practical range)

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

     Martin Schlather, martin.schlather@cu.lu <URL:
     http://www.cu.lu/~schlathe>

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

     Goovaerts, P. (1997) _Geostatistics for Natural Resources
     Evaluation._ New York: Oxford University Press.

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

     'CovarianceFct', 'RandomFields', 'RFparameters',

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

     GetPracticalRange("exponential")
     GetPracticalRange("whittlematern",kappa=2)
     GetPracticalRange("gengneiting",kappa=c(a=3,b=5))

