gridpts               package:splancs               R Documentation

_G_e_n_e_r_a_t_e _a _g_r_i_d _o_f _p_o_i_n_t_s

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

     Generate a grid of points

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

     gridpts(poly,npts,xs,ys)

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

    poly: polygon in which to generate the points 

    npts: approximate number of points to generate 

   xs,ys: grid spacing in x and y 

          Either 'npts' or 'xs' and 'ys' must be specified. If all
          three are given then 'xs' and 'ys' are ignored.  

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

     A points object containing a grid of points inside the polygon. If
     'npts' is specified, then a grid spacing 'xs' and 'ys' will be
     calculated to give approximately 'npts' in the polygon. If 'xs'
     and 'ys' are given then these will be used to generate a number of
     points in the polygon.

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

     Rowlingson, B. and Diggle, P. 1993 Splancs: spatial point pattern
     analysis code in S-Plus.  Computers and Geosciences, 19, 627-655;
     the original sources can be accessed at: <URL:
     http://www.maths.lancs.ac.uk/~rowlings/Splancs/>. See also Bivand,
     R. and Gebhardt, A. 2000 Implementing functions for spatial
     statistical analysis using the R language. Journal of Geographical
     Systems, 2, 307-317.

