spacecloud             package:sgeostat             R Documentation

_V_a_r_i_o_g_r_a_m _C_l_o_u_d

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

     Create a scatter plot of square-root or squared differences
     between variable values at pairs of points versus the distance
     between the points.

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

     spacecloud(point.obj, pair.obj, a1, a2=a1, type='r', query.a, ...)

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

point.obj: a point object generated by `point()'

pair.obj: a pair object generated by `pair()'

      a1: a variable to plot

      a2: an optional variable name, if entered the plot will be
          created between `a1' and `a2'

    type: either `'r'' for square-root differences or `'s'' for squared
          differences

 query.a: an optional variable name, if entered, the value of the
          variable will be displayed on the graphics device for points
          identified by the user.

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

     NULL

_N_o_t_e:

     When `query.a' is entered, the user will be prompted to identify
     points on the display device. Because each point in the plot
     represents a pair of locations, the user must identify each point
     twice, once for the "from" point and once for the "to" point.
     Querying is ended by pressing the middle mouse button on the mouse
     while the cursor is in the display window.

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

     http://www.gis.iastate.edu/SGeoStat/homepage.html

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

     `point', `pair'

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

     opar <- par(ask = interactive() && .Device == "X11")
     spacecloud(maas.point,maas.pair,'zinc')
     # identify some points:
     spacecloud(maas.point,maas.pair,'zinc',query.a='zinc')
     par(opar)

