

spacecloud {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 differ-
     ences between variable values at pairs of points versus
     the distance between the points.

_U_s_a_g_e_:

     spacecloud(point.obj, pair.obj, v1, v2=v1, 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()'

      v1: a variable to plot

      v2: an optional variable name, if entered the plot
          will be created between `v1' and `v2'

    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)

