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The use of visual display technology to present the results of programmed digital computations is as old as the stored program digital computer. But it is the reduced costs of this technology and its widespread application in the interactive computer environment that have rejuvenated the idea during the past decade and made it appear new. This paper describes one adaptation of presentation graphics to a particular interactive computing environment, that of APL. Presentation graphics is a term used to describe the subset of computer graphics applications principally characterized by the use of graphics technology to present datain pictorial form, enhancing discovery and comprehension of relationships and characteristics. Generally, the emphasis is on graphic output, as opposed to those applications like computer-aided design that depend on dynamic human interaction using graphic input techniques. This does not imply that presentation graphics is not interactive; interactivity may be achieved through alternative techniques, including the use of command languages. It is in this context that APL is particularly appropriate.
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