Find the dimensions of the device surface of the current device.
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.
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