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.\" RCSid "$Id: bgraph.1,v 1.2 2003/12/09 15:59:06 greg Exp $"
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.TH BGRAPH 1 6/24/98 RADIANCE
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.SH NAME
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bgraph - do a set of batch graphs to a metafile
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.SH SYNOPSIS
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.B bgraph
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[
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.B \-type ..
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][
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.B +variable value ..
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][
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.B file ..
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]
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.SH DESCRIPTION
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.I Bgraph
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reads each graph
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.I file
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in sequence and converts it to a plot suitable
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for use by a metafile driver program.
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If no files are given, the standard input is read.
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.PP
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The graph type can be defined with a
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.I \-type
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option.
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Types are simply include files which set default values for
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certain variables.
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The actual include file name is the type concatanated with ".plt".
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Typical types are "scatter", "line", and "curve".
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A scatter graph shows only points.
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A line graph shows only lines connecting points.
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A curve graph shows both points and connecting lines.
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.PP
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Variables can be set explicitly with
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.I +variable value
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options.
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The following standard graph variables are supported:
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.TP 10n
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.BR fthick
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The frame thickness, valued from 0 to 4.
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A value of 0 turns the frame off.
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.TP
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.BR grid
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The grid: 1 is on, 0 is off.
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.TP
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.BR include
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The include file name.
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Graph input is taken from the file.
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If the file is not found in the current directory, it is
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searched for in a set of standard locations.
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.TP
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.BR legend
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The legend title.
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.TP
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.BR othick
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The origin axis thickness, valued from 0 to 4.
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A value of 0 turns the origin off.
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.TP
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.BR period
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The period for a polar plot.
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For a plot in degrees, use 360.
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For radians, use 6.283.
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A value of 0 (the default) indicates a Cartesian plot.
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.TP
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.BR subtitle
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The graph subtitle.
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.TP
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.BR symfile
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The point symbol metafile.
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.TP
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.BR tstyle
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The frame tick mark style.
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The default value is 1, which is outward tick marks.
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A value of 2 is inward ticks, 3 is cross ticks.
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A value of 0 disables frame tick marks.
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.TP
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.BR title
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The graph title.
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.TP
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.BR xlabel
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The x axis label.
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.TP
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.BR xmap
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The x axis mapping function.
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An x axis mapping xmap(x)=log(x) produces a log x axis.
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.TP
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.BR xmax
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The x axis maximum.
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.TP
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.BR xmin
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The x axis minimum.
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.TP
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.BR xstep
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The x axis step.
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.TP
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.BR ylabel
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The y axis label.
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.TP
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.BR ymap
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The y axis mapping function.
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An y axis mapping ymap(y)=log(y) produces a log y axis.
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.TP
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.BR ymax
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The y axis maximum.
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.TP
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.BR ymin
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The y axis minimum.
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.TP
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.BR ystep
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The y axis step.
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.PP
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In addition to the standard graph variables, each curve
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has a set of variables.
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The variables for curve 'A' all begin with the letter 'A';
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the variables for curve 'B' all begin with the letter 'B',
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and so on.
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Up to 8 curves are supported on a single graph, 'A'
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through 'H'.
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The variables for curve 'A' are:
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.TP 10n
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.BR A
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The function for curve 'A'.
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If
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.I Adata
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is undefined,
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.I xmin,
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.I xmax
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and
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.I Anpoints
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are used to determine which x values to plot.
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If
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.I Adata
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is defined and
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.I A
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is a function of a single variable (ie. A(x)),
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data values are interpreted as x values to be plotted.
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If
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.I Adata
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is defined and
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.I A
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is a function of two variables (ie. A(x,y)),
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data values are interpreted as (x,y) pairs and
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.I A
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becomes a mapping function for the data.
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.TP
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.BR Acolor
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The color for curve A.
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The values 1-4 map to black, red, green, and blue respectively.
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A value of 0 turns curve A off.
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.TP
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.BR Adata
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The point data for curve 'A'.
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If
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.I Adata
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is set to the name of a file,
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data is read and interpreted from that file.
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If
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.I Adata
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is set to a command (beginning with an exclamation, '!'),
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the output of the command is read as data.
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Otherwise, data is read from the current file.
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Data values are separated by white space and/or commas.
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A semicolon or end of file indicates the end of data.
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.TP
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.BR Alabel
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The label for curve 'A'.
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The curve label is printed in the legend when a curve is defined.
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.TP
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.BR Alintype
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The line type for curve 'A', valued from 0 to 4.
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A value of 0 turns line drawing off.
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A value of 1 is solid, 2 is dashed, 3 is dotted, and 4 is dot-dashed.
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.TP
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.BR Anpoints
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The number of symbol points for curve 'A'.
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If
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.I Adata
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is defined, all points will be connected with the selected
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curve line, but only
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.I Anpoints
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points will be indicated with a symbol.
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This prevents messy graphs when large number of points are defined.
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If
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.I A
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is defined and
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.I Adata
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is not,
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.I Anpoints
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is used along with
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.I xmin
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and
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.I xmax
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to determine which x values to plot.
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.TP
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.BR Asymsize
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The symbol radius for curve 'A'.
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The default size is 100.
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A value of 0 turns symbols off.
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.TP
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.BR Asymtype
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This is the name of a segment in
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.I symfile
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which defines the graphics symbol for curve 'A'.
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.TP
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.BR Athick
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The line thickness for curve 'A', valued from 0 to 4.
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A thickness of 0 turns line drawing off.
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.SH "GRAPH FILE FORMAT"
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A graph file contains definitions for graph and curve
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variables.
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These definitions fall one per line in the following formats:
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.nf
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vreal = expression # real variable
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vfunction(x) = expression(x) # function
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vstring = "string" # string variable
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vdata = filename # data file
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vdata = "!command" # data generator
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variable = continued \\
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line # newline escaped
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vdata = # data
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v1 v2 v3 v4 ... ;
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.fi
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Comments are preceded by a '#', and continue to the end
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of the line.
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Except for comments, the newline can be escaped with a backslash.
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Note that in the special case where data is contained in
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the graph file, a definition will continue over more than
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one line.
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Data values can be separated by commas or white space, and
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reading continues until a semicolon is reached.
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No comments are allowed in the data section of a file.
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.PP
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An expression is an algebraic formula containing numbers,
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variables, functions, and the standard operators
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{+,-,*,/,^,(,)} (see icalc(1)).
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Besides the variables described in the last section,
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definitions of intermediate real variables and functions
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are allowed for convenience.
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They may be used in expressions of graph and curve variables.
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.SH EXAMPLE
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A file to graph the sine function is:
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.nf
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title = "Sine Function from 0 to Pi"
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PI = 3.141592653589793
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A(x) = sin(x)
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xmin = 0
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xmax = PI
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Anpoints = 100
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.fi
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Or, to graph selected points:
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.nf
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title = "Sine Function at 0, .2, .6, and .8"
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A(x) = sin(x)
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Adata =
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0 , .2
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.6 , .8
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;
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.fi
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The commands to plot these files might be:
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.nf
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bgraph -line sine1.plt | impress | ipr
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bgraph -curve +ymin -1 +ymax 1 sine2.plt | t4014
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.fi
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.SH FILES
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/usr/local/lib/meta/*.mta
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/usr/local/lib/meta/*.plt
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*.plt
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.SH AUTHOR
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Greg Ward
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.SH BUGS
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There is no mechanism provided for undefining a variable.
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An axis mapping function which is not invertible (monotonically
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increasing or decreasing) confuses the program terribly.
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.SH "SEE ALSO"
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dgraph(1), gcomp(1), icalc(1), igraph(1), impress(1),
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metafile(5), mx80(1), mt160l(1), t4014(1), x11meta(1)
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