

_C_o_n_t_r_o_l _M_u_l_t_i_p_l_e _D_e_v_i_c_e_s

     dev.cur()
     dev.list()
     dev.next(which = dev.cur())
     dev.prev(which = dev.cur())
     dev.off(which = dev.cur())
     dev.set(which = dev.next())
     graphics.off()

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

   which: An integer specifying a device number

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

     These functions provide control over multiple graphics
     devices.

     Only one device is the active device.  This is the dev-
     ice in which all graphics operations occur.

     Devices are associated with a name (e.g., "X11"  or
     "postscript") and a number;  the "null device" is
     always device 1.

     `dev.off' shuts down the specified (by default the
     current) device.  `graphics.off()' shuts down all open
     graphics devices.

     `dev.set' makes the specified device the active device.

     A list of device names is stored in `.Devices'.  The
     name of the active device is stored in `.Device'.

_V_a_l_u_e:

     `dev.cur' returns the number and name of the active
     device.

     `dev.list' returns the numbers and names of all dev-
     ices.

     `dev.next' returns the number and name of the next dev-
     ice in the list of devices.

     `dev.prev' returns the number and name of the previous
     device in the list of devices.

     `dev.off' returns the name and number of the new active
     device (after the specified device has been shut down).

     `dev.set' returns the name and number of the new active
     device.

_S_e_e _A_l_s_o:

     `Devices', such as `postscript', etc; `graphic.off()'
     for closing all devices.

     `layout' and its links for setting up plotting regions
     on the current device.

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

     x11()
     plot(1:10)
     x11()
     plot(rnorm(10))
     dev.set(dev.prev())
     abline(0,1)# through the 1:10 points
     dev.set(dev.next())
     abline(h=0, col="gray")# for the residual plot
     dev.set(dev.prev())
     dev.off(); dev.off()#- close the two X devices

