zoom                 package:splancs                 R Documentation

_I_n_t_e_r_a_c_t_i_v_e_l_y _s_p_e_c_i_f_y _a _r_e_g_i_o_n _o_f _a _p_l_o_t _f_o_r _e_x_p_a_n_s_i_o_n

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

     Interactively specify a region of a plot for expansion

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

     zoom(quiet=F,out=F,...)

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

   quiet: If false, prompt the user to enter two coordinates. If true,
          say nothing. 

     out: If true, expand the limits of the current plot by a factor of
          three, centred on the current plot. 

     ...: Other arguments are passed through to pointmap. 

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

     None

_S_i_d_e _E_f_f_e_c_t_s:

     A prompt is optionally displayed, and the user selects two points
     forming the diagonal of a rectangle. A new, empty plot is created
     that has its axis limits set to the bounding square of the
     selected rectangle.  If `out=T', no prompt is displayed, and a new
     blank plot is created with its limits in x and y set to span an
     area three times the height and width centred on the current
     centre.

_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.

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

     `pointmap'

