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PLOT(6)								       PLOT(6)

       plot - graphics interface

       Files of this format are interpreted by plot(1) to draw graphics on the
       screen.	A plot file is a UTF stream of instruction  lines.   Arguments
       are  delimited  by  spaces,  tabs,  or commas.  Numbers may be floating
       point.  Punctuation marks (except , spaces, and tabs at	the  beginning
       of  lines  are  ignored.	  Comments run from to newline.	 Extra letters
       appended to a valid instruction are ignored.  Thus all  mean  the  same
       thing.  Arguments are interpreted as follows:

       1.     If an instruction requires no arguments, the rest of the line is

       2.     If it requires a string argument, then all the  line  after  the
	      first field separator is passed as argument.  Quote marks may be
	      used to preserve leading blanks.	Strings may  include  newlines
	      represented as

       3.     Between  numeric arguments alphabetic characters and punctuation
	      marks are ignored.  Thus line from 5 6 to 7 8 draws a line  from
	      (5, 6) to (7, 8).

       4.     Instructions with numeric arguments remain in effect until a new
	      instruction is read.  Such commands may spill over  many	lines.
	      Thus  the	 following  sequence will draw a polygon with vertices
	      (4.5, 6.77), (5.8, 5.6), (7.8, 4.55), and (10.0, 3.6).

	      move 4.5 6.77
	      vec 5.8, 5.6 7.8
	      4.55 10.0, 3.6 4.5, 6.77

       The instructions are executed in order.	The last designated point in a
       line,  move,  rmove, vec, rvec, arc, or point command becomes the `cur‐
       rent point' (X,Y) for the next command.

   Open & Close
       o string	 Open plotting device.	For troff, string specifies  the  size
		 of the plot (default is

       cl	 Close plotting device.

   Basic Plotting Commands
       e	 Start another frame of output.

       m x y	 (move) Current point becomes x y.

       rm dx dy	 Current point becomes X+dx Y+dy.

       poi x y	 Plot the point x y and make it the current point.

       v x y	 Draw a vector from the current point to x y.

       rv dx dy	 Draw vector from current point to X+dx Y+dy

       li x1 y1 x2 y2
		 Draw  a  line from x1 y1 to x2 y2.  Make the current point x2

       t string	 Place the string so that its first character is  centered  on
		 the  current  point  (default).   If string begins with it is
		 centered (right-adjusted) on the current point.  A  backslash
		 at  the  beginning  of the string may be escaped with another

       a x1 y1 x2 y2 xc yc r
		 Draw a circular arc from x1 y1 to x2 y2 with center xc yc and
		 radius	 r.  If the radius is positive, the arc is drawn coun‐
		 terclockwise; negative, clockwise.   The  starting  point  is
		 exact but the ending point is approximate.

       ci xc yc r
		 Draw  a circle centered at xc yc with radius r.  If the range
		 and frame parameters do not specify a	square,	 the  `circle'
		 will be elliptical.

       di xc yc r
		 Draw a disc centered at xc yc with radius r using the filling
		 color (see cfill below).

       bo x1 y1 x2 y2
		 Draw a box with lower left corner at x1 y1  and  upper	 right
		 corner at x2 y2.

       sb x1 y1 x2 y2
		 Draw  a  solid	 box with lower left corner at x1 y1 and upper
		 right corner at x2 y2 using  the  filling  color  (see	 cfill

       par x1 y1 x2 y2 xg yg
		 Draw  a  parabola from x1 y1 to x2 y2 `guided' by xg yg.  The
		 parabola passes through the midpoint of the line  joining  xg
		 yg  with the midpoint of the line joining x1 y1 and x2 y2 and
		 is tangent to the lines from xg yg to the endpoints.

       pol { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
		 Draw polygons with vertices x1 y1 ... xn yn and X1 Y1 ...  Xm
		 Ym.  If only one polygon is specified, the inner brackets are
		 not needed.

       fi { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
		 Fill a polygon.  The arguments are the same as those for  pol
		 except	 that  the  first  vertex is automatically repeated to
		 close each polygon.  The polygons do  not  have  to  be  con‐
		 nected.  Enclosed polygons appear as holes.

       sp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
		 Draw a parabolic spline guided by x1 y1 ... xn yn with simple

       fsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
		 Draw a parabolic spline guided by x1 y1 ... xn yn with double
		 first endpoint.

       lsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
		 Draw a parabolic spline guided by x1 y1 ... xn yn with double
		 last endpoint.

       dsp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }
		 Draw a parabolic spline guided by x1 y1 ... xn yn with double

       csp { {x1 y1 ... xn yn} ... {X1 Y1 ... Xm Ym} }

       in filename
		 (include) Take commands from filename.

       de string { commands }
		 Define string as commands.

       ca string scale
		 Invoke commands defined as string applying scale to all coor‐

   Commands Controlling the Environment
       co string Use color given by first character of	string,	 one  of  red,
		 yellow, green, blue, cyan, magenta, white, and kblack.

       pe string Use string as the style for drawing lines.  The available pen
		 styles are: solid, dott[ed], short, long, dotd[ashed], cdash,

       cf string Color for filling (see co, above).

       ra x1 y1 x2 y2
		 The data will fall between x1 y1 and x2 y2.  The plot will be
		 magnified or reduced to fit the device as closely  as	possi‐

		 Range settings that exactly fill the plotting area with unity
		 scaling appear below for devices supported by the filters  of
		 plot(1).   The upper limit is just outside the plotting area.
		 In every case the plotting area is taken to be square; points
		 outside may be displayable on devices with nonsquare faces.

       fr px1 py1 px2 py2
		 Plot the data in the fraction of the display specified by px1
		 py1 for lower left corner and px2 py2 for upper right corner.
		 Thus  plots  in the lower right quadrant of the display; uses
		 the whole display but inverts the y coordinates.

       sa	 Save the current environment, and move to a new one.  The new
		 environment inherits the old one.  There are 7 levels.

       re	 Restore previous environment.

       plot(1), graph(1)

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