boxplot.matrix           package:graphics           R Documentation

_D_r_a_w _a _B_o_x_p_l_o_t _f_o_r _e_a_c_h _C_o_l_u_m_n (_R_o_w) _o_f _a _M_a_t_r_i_x

_D_e_s_c_r_i_p_t_i_o_n:

     Interpreting the columns (or rows) of a matrix as different
     groups, draw a boxplot for each.

_U_s_a_g_e:

     ## S3 method for class 'matrix':
     boxplot(x, use.cols = TRUE, ...)

_A_r_g_u_m_e_n_t_s:

       x: a numeric matrix.

use.cols: logical indicating if columns (by default) or rows
          ('use.cols=FALSE') should be plotted.

     ...: Further arguments to 'boxplot'.

_V_a_l_u_e:

     A list as for 'boxplot'.

_A_u_t_h_o_r(_s):

     Martin Maechler, 1995, for S+, then R package 'sfsmisc'.

_S_e_e _A_l_s_o:

     'boxplot.default' which already works nowadays with data.frames;
     'boxplot.formula', 'plot.factor' which work with (the more general
     concept) of a grouping factor.

_E_x_a_m_p_l_e_s:

     ## Very similar to the example in ?boxplot
     mat <- cbind(Uni05 = (1:100)/21, Norm = rnorm(100),
                  T5 = rt(100, df = 5), Gam2 = rgamma(100, shape = 2))
     boxplot(mat, main = "boxplot.matrix(...., main = ...)",
             notch = TRUE, col = 1:4)