banking               package:lattice               R Documentation

_B_a_n_k_i_n_g

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

     Calculates banking slope

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

     banking(dx, dy)

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

  dx, dy: vector of consecutive x, y differences. 

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

     'banking' is a crude banking function used when 'aspect = "xy"' in
     high level Trellis functions. It is usually not very meaningful
     except with 'xyplot'.  It just considers the absolute slopes
     (based on 'dx' and 'dy') and returns a value which when adjusted
     by the panel scale limits will make the median of the above
     absolute slopes correspond to a 45 degree line.

     This function was inspired by the discussion of banking in the
     documentation for Trellis Graphics available at Bell Labs' website
     (see 'Lattice'), but is most likely identical to an algorithm
     described previously by Cleveland et al (see below).  It is not
     clear (to the author) whether this is the algorithm used in
     S-PLUS.  Alternative banking rules, implemented as a similar
     function, can be used as a drop-in replacement by suitably
     modifying 'lattice.options("banking")'.

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

     Deepayan Sarkar Deepayan.Sarkar@R-project.org

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

     Cleveland, William S.,  McGill, Marylyn E. and McGill, Robert
     (1988), "The Shape Parameter of a Two-variable Graph", _Journal of
     the American Statistical Association_, 83, 289-300

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

     'Lattice', 'xyplot'

