plot.factor             package:graphics             R Documentation

_P_l_o_t_t_i_n_g _F_a_c_t_o_r _V_a_r_i_a_b_l_e_s

_D_e_s_c_r_i_p_t_i_o_n:

     This functions implements a "scatterplot" method for 'factor'
     arguments of the _generic_ 'plot' function. Actually, 'boxplot' or
     'barplot' are used when appropriate.

_U_s_a_g_e:

     ## S3 method for class 'factor':
     plot(x, y, legend.text = levels(y), ...)

_A_r_g_u_m_e_n_t_s:

     x,y: numeric or factor.  'y' may be missing.

legend.text: a vector of text used to construct a legend for the plot.
          Only used if 'y' is present and a factor.

     ...: Further arguments to 'plot', see also 'par'.

_S_e_e _A_l_s_o:

     'plot.default', 'plot.formula', 'barplot', 'boxplot'.

_E_x_a_m_p_l_e_s:

     data(PlantGrowth)
     plot(PlantGrowth)                                # -> plot.data.frame
     plot(weight ~ group, data = PlantGrowth)         # numeric vector ~ factor
     plot(cut(weight, 2) ~ group, data = PlantGrowth) # factor ~ factor
     ## passing "..." to barplot() eventually:
     plot(cut(weight, 3) ~ group, data = PlantGrowth, density = 16*(1:3),col=NULL)

     plot(PlantGrowth$group, axes=FALSE, main="no axes")# extremly silly

