gghline                package:ggplot                R Documentation

_G_r_o_b _f_u_n_c_t_i_o_n: _h_l_i_n_e

_D_e_s_c_r_i_p_t_i_o_n:

     Add horizontal line(s) to a plot

_U_s_a_g_e:

     gghline(plot = .PLOT, aesthetics=list(), ..., data=NULL)

_A_r_g_u_m_e_n_t_s:

    plot: the plot object to modify

aesthetics: named list of aesthetic mappings, see details for more
          information

     ...: other options, see details for more information

    data: data source, if not specified the plot default will be used

_D_e_t_a_i_l_s:

     Aesthetic mappings that this grob function understands:

        *  none

     Other options:

        *  'position': vertical position(s) to draw lines

        *  'colour': line colour

        *  'size': line thickness

        *  'linetype': line type

        *  'range': x (or y if slope infinite) range to draw the line. 
           This is sometimes necessary because ggplot isn't smart
           enough to calculate the entire range of the data

_A_u_t_h_o_r(_s):

     Hadley Wickham <h.wickham@gmail.com>

_E_x_a_m_p_l_e_s:

     p <- ggplot(mtcars, aesthetics=list(x = wt, y=mpg))
     gghline(ggpoint(p), position=mean(mtcars$mpg), size=2)

