stars                  package:base                  R Documentation

_S_t_a_r _P_l_o_t_s _a_n_d _S_e_g_m_e_n_t _D_i_a_g_r_a_m_s _o_f _M_u_l_t_i_v_a_r_i_a_t_e _D_a_t_a

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

     Star plots or segment diagrams are created on the current graphics
     device.

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

     stars(x, full = TRUE, scale = TRUE, radius = TRUE, labels =
           dimnames(x)[[1]], locations = NULL, xlimit = NULL, ylimit = NULL,
           len = 1, colors = NULL, key.loc = NULL, key.labels = NULL,
           draw.segments = FALSE, draw.axes = FALSE, ...)

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

       x: matrix of data.  One segment plot will be produced for each
          row of the matrix.  Missing values (`NA') are allowed, but
          they are treated as if they were 0.

    full: logical flag: if `TRUE', the segment plots will occupy a full
          circle.  Otherwise, they occupy the (upper) semicircle only.

   scale: logical flag: if `TRUE', the columns of the data matrix are
          scaled independently so that the maximum value in each column
          is 1 and the minimum is 0.  If `FALSE', the presumption is
          that the data have been scaled by some other algorithm to the
          range [0,1].

  radius: logical flag: in `TRUE', the radii corresponding to each
          variable in the data will be drawn.

  labels: vector of character strings for labeling the plots. Unlike
          the S function `stars', no attempt is made to construct
          labels if `labels = NULL'.

locations: two column matrix with the x and y coordinates used to place
          each of the segment plots.  If `locations' is `NULL' the
          segment plots will be placed in a rectangular grid.

  xlimit: vector with the range of x coordinates to plot. 

  ylimit: vector with the range of y coordinates to plot.

     len: scale factor for the length of radii or segments.

  colors: vector of integers, each of which specifies  a color for one
          of the segments.  Ignored if `draw.segments = FALSE'

 key.loc: vector with x and y coordinates of the unit key.

key.labels: vector of character strings for labeling the segments of
          the unit key.  If omitted, the second component of
          `dimnames(x)' is used, if available.

draw.axes: logical flag: if `TRUE' axes are added to the plot.

     ...: any other arguments, typically arguments to `par'.

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

     Missing values are treated as 0.

     Each star plot or segment diagram represents one row of the input
     `x'.  Variables (columns) start on the right and wind
     counterclockwise around the circle.  The size of the (scaled)
     column is shown by the distance from the center to the point on
     the star or the radius of the segment representing the variable.

     Only one page of output is produced.

_N_o_t_e:

     This code started life as spatial star plots by David A. Andrews.
     See <URL:
     http://www.stat.rice.edu/~andrewsd/software/software.html>.

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

     Thomas S. Dye

_E_x_a_m_p_l_e_s:

     data(mtcars)
     stars(mtcars[, 1:7], len = 0.8, key.loc = c(12, 2),
           main = "Motor Trend Cars", full = FALSE) 

     stars(mtcars[, 1:7], len = 0.8, key.loc = c(12, 2),
           main = "Motor Trend Cars", draw.segments = TRUE)

     data(USJudgeRatings)
     stars(USJudgeRatings, labels = abbreviate(case.names(USJudgeRatings)),
           key.loc = c(13, 1.5), main = "Judge not ...", len = 0.8)

