segments              package:graphics              R Documentation

_A_d_d _L_i_n_e _S_e_g_m_e_n_t_s _t_o _a _P_l_o_t

_D_e_s_c_r_i_p_t_i_o_n:

     Draw line segments between pairs of points.

_U_s_a_g_e:

     segments(x0, y0, x1, y1,
              col = par("fg"), lty = par("lty"), lwd = par("lwd"),
              ...)

_A_r_g_u_m_e_n_t_s:

  x0, y0: coordinates of points *from* which to draw.

  x1, y1: coordinates of points *to* which to draw.

col, lty, lwd: usual graphical parameters as in 'par', possibly
          vectors.  'NA' values in 'col' cause the segment to be
          omitted.

     ...: further graphical parameters (from 'par'), such as 'xpd' and
          the line characteristics 'lend', 'ljoin' and 'lmitre'.

_D_e_t_a_i_l_s:

     For each 'i', a line segment is drawn between the point '(x0[i],
     y0[i])' and the point '(x1[i], y1[i])'.

     The graphical parameters 'col', 'lty' and 'lwd' can be vectors of
     length greater than one and will be recycled if necessary.

_R_e_f_e_r_e_n_c_e_s:

     Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) _The New S
     Language_. Wadsworth & Brooks/Cole.

_S_e_e _A_l_s_o:

     'arrows',  'polygon' for slightly easier and less flexible line
     drawing, and 'lines' for the usual polygons.

_E_x_a_m_p_l_e_s:

     x <- runif(12); y <- rnorm(12)
     i <- order(x,y); x <- x[i]; y <- y[i]
     plot(x, y, main="arrows(.) and segments(.)")
     ## draw arrows from point to point :
     s <- seq(length(x)-1)# one shorter than data
     arrows(x[s], y[s], x[s+1], y[s+1], col= 1:3)
     s <- s[-length(s)]
     segments(x[s], y[s], x[s+2], y[s+2], col= 'pink')

