gridcreate regions in where to print graphs. Used for the generation of printouts
createviewport( name, left, top, width, height, pwidth = 8.27,
pheight = 11.69 )name of he viewport
a numeric vector or unit object specifying left location (in inches)
a numeric vector or unit object specifying topvflocation (in inches)
a numeric vector or unit object specifying width (in inches)
a numeric vector or unit object specifying height (in inches)
width of the page (in inches). Default is 8.27
height of the page (in inches). Default is 11.69
returns a viewport object
create regions in where to print graphs. Used for the generation of printouts