eqscplot                package:MASS                R Documentation

_P_l_o_t_s _w_i_t_h _G_e_o_m_e_t_r_i_c_a_l_l_y _E_q_u_a_l _S_c_a_l_e_s

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

     Version of a scatterplot with scales chosen to be equal on both
     axes, that is 1cm represents the same units on each

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

     eqscplot(x, y, ratio = 1, tol = 0.04, uin, ...)

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

       x: vector of x values, or a 2-column matrix, or a list with
          components `x' and `y' 

       y: vector of y values 

   ratio: desired ratio of units on the axes. Units on the y axis are
          drawn at `ratio' times the size of units on the x axis.
          Ignored if `uin' is specified and of length 2. 

     tol: proportion of white space at the margins of plot 

     uin: desired values for the units per inch parameter. If of length
          1, the desired units per inch on the x axis. 

     ...: further arguments for `plot' 

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

     Limits for the x and y axes are chosen so that they include the
     data. One of the sets of limits is then stretched from the
     midpoint to make the units in the ratio given by `ratio'. Finally
     both are stretched by `1 + tol' to move points away from the axes,
     and the points plotted.

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

     invisibly, the values of `uin' used for the plot.

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

     performs the plot.

_N_o_t_e:

     Arguments `ratio' and `uin' were suggested by Bill Dunlap.

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

     `plot', `par'

