Find the dimensions of the device surface of the current device.
dev.size(units = c("in", "cm", "px"))
the units in which to return the value -- inches, cm, or
pixels (device units).
A two-element numeric vector giving width and height of the current
device; a new device is opened if there is none, similarly to
The size information in inches can be obtained by
par("din"), but this provides a way to access it
independent of the graphics sub-system in use. Note that
par("din") is only updated when a new plot is started, whereas
dev.size tracks the size as an on-screen device is resized.