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bgraph - do a set of batch graphs to a metafile

bgraph[-type..][+variablevalue..][file..]

Bgraphreads each graphfilein sequence and converts it to a plot suitable for use by a metafile driver program. If no files are given, the standard input is read. The graph type can be defined with a-typeoption. Types are simply include files which set default values for certain variables. The actual include file name is the type concatanated with ".plt". Typical types are "scatter", "line", and "curve". A scatter graph shows only points. A line graph shows only lines connecting points. A curve graph shows both points and connecting lines. Variables can be set explicitly with+variablevalueoptions. The following standard graph variables are supported:fthickThe frame thickness, valued from 0 to 4. A value of 0 turns the frame off.gridThe grid: 1 is on, 0 is off.includeThe include file name. Graph input is taken from the file. If the file is not found in the current directory, it is searched for in a set of standard locations.legendThe legend title.othickThe origin axis thickness, valued from 0 to 4. A value of 0 turns the origin off.periodThe period for a polar plot. For a plot in degrees, use 360. For radians, use 6.283. A value of 0 (the default) indicates a Cartesian plot.subtitleThe graph subtitle.symfileThe point symbol metafile.tstyleThe frame tick mark style. The default value is 1, which is outward tick marks. A value of 2 is inward ticks, 3 is cross ticks. A value of 0 disables frame tick marks.titleThe graph title.xlabelThe x axis label.xmapThe x axis mapping function. An x axis mapping xmap(x)=log(x) produces a log x axis.xmaxThe x axis maximum.xminThe x axis minimum.xstepThe x axis step.ylabelThe y axis label.ymapThe y axis mapping function. An y axis mapping ymap(y)=log(y) produces a log y axis.ymaxThe y axis maximum.yminThe y axis minimum.ystepThe y axis step. In addition to the standard graph variables, each curve has a set of variables. The variables for curve ’A’ all begin with the letter ’A’; the variables for curve ’B’ all begin with the letter ’B’, and so on. Up to 8 curves are supported on a single graph, ’A’ through ’H’. The variables for curve ’A’ are:AThe function for curve ’A’. IfAdatais undefined,xmin,xmaxandAnpointsare used to determine which x values to plot. IfAdatais defined andAis a function of a single variable (ie. A(x)), data values are interpreted as x values to be plotted. IfAdatais defined andAis a function of two variables (ie. A(x,y)), data values are interpreted as (x,y) pairs andAbecomes a mapping function for the data.AcolorThe color for curve A. The values 1-4 map to black, red, green, and blue respectively. A value of 0 turns curve A off.AdataThe point data for curve ’A’. IfAdatais set to the name of a file, data is read and interpreted from that file. IfAdatais set to a command (beginning with an exclamation, ’!’), the output of the command is read as data. Otherwise, data is read from the current file. Data values are separated by white space and/or commas. A semicolon or end of file indicates the end of data.AlabelThe label for curve ’A’. The curve label is printed in the legend when a curve is defined.AlintypeThe line type for curve ’A’, valued from 0 to 4. A value of 0 turns line drawing off. A value of 1 is solid, 2 is dashed, 3 is dotted, and 4 is dot-dashed.AnpointsThe number of symbol points for curve ’A’. IfAdatais defined, all points will be connected with the selected curve line, but onlyAnpointspoints will be indicated with a symbol. This prevents messy graphs when large number of points are defined. IfAis defined andAdatais not,Anpointsis used along withxminandxmaxto determine which x values to plot.AsymsizeThe symbol radius for curve ’A’. The default size is 100. A value of 0 turns symbols off.AsymtypeThis is the name of a segment insymfilewhich defines the graphics symbol for curve ’A’.AthickThe line thickness for curve ’A’, valued from 0 to 4. A thickness of 0 turns line drawing off.

A graph file contains definitions for graph and curve variables. These definitions fall one per line in the following formats: vreal = expression # real variable vfunction(x) = expression(x) # function vstring = "string" # string variable vdata = filename # data file vdata = "!command" # data generator variable = continued \ line # newline escaped vdata = # data v1 v2 v3 v4 ... ; Comments are preceded by a ’#’, and continue to the end of the line. Except for comments, the newline can be escaped with a backslash. Note that in the special case where data is contained in the graph file, a definition will continue over more than one line. Data values can be separated by commas or white space, and reading continues until a semicolon is reached. No comments are allowed in the data section of a file. An expression is an algebraic formula containing numbers, variables, functions, and the standard operators {+,-,*,/,^,(,)} (see icalc(1)). Besides the variables described in the last section, definitions of intermediate real variables and functions are allowed for convenience. They may be used in expressions of graph and curve variables.

A file to graph the sine function is: title = "Sine Function from 0 to Pi" PI = 3.141592653589793 A(x) = sin(x) xmin = 0 xmax = PI Anpoints = 100 Or, to graph selected points: title = "Sine Function at 0, .2, .6, and .8" A(x) = sin(x) Adata = 0 , .2 .6 , .8 ; The commands to plot these files might be: bgraph -line sine1.plt | psmeta | lpr bgraph -curve +ymin -1 +ymax 1 sine2.plt | x11meta

/usr/local/lib/meta/*.mta /usr/local/lib/meta/*.plt *.plt

Greg Ward

There is no mechanism provided for undefining a variable. An axis mapping function which is not invertible (monotonically increasing or decreasing) confuses the program terribly.

dgraph(1), gcomp(1), icalc(1), igraph(1), metafile(5), x11meta(1)