Skip to Content  dev {grDevices}  Control Multiple Devices R
3.0.2   These functions provide control over multiple graphics
devices.   dev.list() = dev.cur()) dev.prev(which = dev.cur()) =
dev.cur()) dev.set(which =   An integer specifying a device
number. arguments to be passed to the device selected.   Only
one device is the ‘active’ device: this is the device in which
all graphics operations occur. There is a "null device" which is
always open but is really a placeholder: any attempt to use it
will open a new device specified by getOption("device")).
Devices are associated with a name (e.g., "X11" or "postscript")
and a number in the range 1 to 63; the "null device" is always
device 1. Once a device has been opened the null device is not
considered as a possible active device. There is a list of open
devices, and this is considered as a circular list not including
the null device. and dev.prev select the next open device in the
appropriate direction, unless no device is open. shuts down the
specified (by