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GRAP(1)				 User Commands			       GRAP(1)

NAME
       grap - pic preprocessor for drawing graphs

SYNOPSIS
       grap [-SU] [file]

DESCRIPTION
       Grap  is	 a  pic(1)  preprocessor  for  drawing graphs on a typesetter.
       Graphs are surrounded by	the troff `commands' .G1 and  .G2.   Data  are
       scaled  and  plotted, with tick marks supplied automatically.  Commands
       exist to	modify the frame, add  labels,	override  the  default	ticks,
       change  the  plotting  style,  define coordinate	ranges and transforma-
       tions, and include data from files.  In	addition,  grap	 provides  the
       same loops, conditionals, and macro processing that pic does.

       frame  ht  e  wid  e  top dotted	...: Set the frame around the graph to
       specified ht and	wid; default is	2 by  3	 (inches).   The  line	styles
       (dotted,	 dashed, invis,	solid (default)) of the	sides (top, bot, left,
       right) of the frame can be set independently.

       label side "a label" "as	a set of strings" adjust: Place	label on spec-
       ified  side; default side is bottom.  adjust is up (or down left	right)
       expr to shift default position; width expr sets the width explicitly.

       ticks side in at	optname	expr, expr, ...: Put ticks on  side  at	 expr,
       ...,  and  label	 with "expr".  If any expr is followed by "...", label
       tick with "...",	and turn off all automatic labels.  If "..."  contains
       %f's,  they  will  be interpreted as printf formatting instructions for
       the tick	value.	Ticks point in or out (default out).   Tick  iterator:
       instead of at ..., use from expr	to expr	by op expr where op is option-
       ally +-*/ for additive or multiplicative	steps.	by can be omitted,  to
       give steps of size 1.  If no ticks are requested, they are supplied au-
       tomatically; suppress this with ticks off.   Automatic  ticks  normally
       leave  a	 margin	 of  7%	on each	side; set this to anything by margin =
       expr.

       grid side linedesc at optname expr, expr, ...: Draw grids perpendicular
       to  side	 in  style linedesc at expr, .... Iterators and	labels work as
       with ticks.

       coord optname x min, max	y min, max log x  log y: Set range  of	coords
       and optional log	scaling	on either or both.  This overrides computation
       of data range.  Default value of	optname	is current  coordinate	system
       (each coord defines a new coordinate system).

       plot  "str"  at point; "str" at point: Put str at point.	 Text position
       can be qualified	with rjust, ljust, above, below	after "...".

       line from point to point	linedesc: Draw line from here to there.	 arrow
       works in	place of line.

       next  optname  at  point	 linedesc: Continue plot of data in optname to
       point; default is current.

       draw optname linedesc ...: Set mode for next: use this style  from  now
       on, and plot "..." at each point	(if given).

       new optname linedesc ...: Set mode for next, but	disconnect from	previ-
       ous.

       A list of numbers x y1 y2 y3 ...	 is treated as plot  bullet  at	 x,y1;
       plot  bullet  at	x,y2; etc., or as next at x,y1 etc., if	draw is	speci-
       fied.  Abscissae	of 1,2,3,... are provided if there is only  one	 input
       number per line.

       A  point	optname	expr, expr maps	the point to the named coordinate sys-
       tem.  A linedesc	is one of dot dash invis solid optionally followed  by
       an expression.

       define  name  {whatever}: Define	a macro.  There	are macros already de-
       fined for standard plotting symbols like	bullet,	 circle,  star,	 plus,
       etc., in	/sys/lib/grap.defines, which is	included if it exists.

       var  = expr: Evaluate an	expression.  Operators are + - * and /.	 Func-
       tions are log and exp (both base	10), sin, cos, sqrt; rand returns ran-
       dom number on [0,1); max(e,e), min(e,e),	int(e).

       print  expr;  print  "...": As a	debugging aid, print expr or string on
       the standard error.

       copy "file name": Include this file right here.

       copy thru macro:	Pass rest of input (until .G2) through macro, treating
       each field (non-blank, or "...")	as an argument.	 macro can be the name
       of a macro previously defined, or the body of one in place, like	 /plot
       $1 at $2,$3/.

       copy  thru  macro until "string": Stop copy when	input is string	(left-
       justified).

       pic remainder of	line: Copy to output with leading blanks removed.

       graph Name pic-position:	Start a	new frame, place it at specified posi-
       tion, e.g., graph Thing2	with .sw at Thing1.se +	(0.1,0).  Name must be
       capitalized to keep pic happy.

       .anything at beginning of line: Copied verbatim.

       sh %anything %: Pass everything between the %'s to the shell;  as  with
       macros,	% may be any character and anything may	include	newlines.  The
       -S option disables execution of the shell command; the  -U  option  re-
       verts the effect	of a previous -S.

       # anything: A comment, which is discarded.

       Order is	mostly irrelevant; no category is mandatory.  Any arguments on
       the .G1 line are	placed on the generated	.PS line for pic.

FILES
       /usr/ucblib/grap.defines
	      definitions of standard plotting characters, e.g., bullet

SEE ALSO
       pic(1), troff(1)
       J. L. Bentley and B. W. Kernighan, ``GRAP--A Language  for  Typesetting
       Graphs'', Unix Research System Programmer's Manual, Tenth Edition, Vol-
       ume 2.

Heirloom Documentation Tools	    2/2/07			       GRAP(1)

NAME | SYNOPSIS | DESCRIPTION | FILES | SEE ALSO

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