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- * graph internal
- graph is the graph mode. It initializes the graphics system and sets the
- screen to graphics mode. You can close graphics mode and go back the text
- mode by the text command. It is useful to freez the graphics by the
- command readchar before back to the text mode.
- See also: text.
- e.g. graph, line(100,100,300,300), readchar, text
-