This is the command bgraph that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator

**PROGRAM:**

**NAME**

bgraph - do a set of batch graphs to a metafile

**SYNOPSIS**

**bgraph**[

**-type**

**..**][

**+variable**

**value**

**..**][

**file**

**..**]

**DESCRIPTION**

__Bgraph__reads each graph

__file__in 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

__-type__option. 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

__+variable__

__value__options. The following standard

graph variables are supported:

**fthick**The frame thickness, valued from 0 to 4. A value of 0 turns the frame off.

**grid**The grid: 1 is on, 0 is off.

**include**The 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.

**legend**The legend title.

**othick**The origin axis thickness, valued from 0 to 4. A value of 0 turns the origin

off.

**period**The 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.

**subtitle**The graph subtitle.

**symfile**The point symbol metafile.

**tstyle**The 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.

**title**The graph title.

**xlabel**The x axis label.

**xmap**The x axis mapping function. An x axis mapping xmap(x)=log(x) produces a log x

axis.

**xmax**The x axis maximum.

**xmin**The x axis minimum.

**xstep**The x axis step.

**ylabel**The y axis label.

**ymap**The y axis mapping function. An y axis mapping ymap(y)=log(y) produces a log y

axis.

**ymax**The y axis maximum.

**ymin**The y axis minimum.

**ystep**The 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:

**A**The function for curve 'A'. If

__Adata__is undefined,

__xmin,__

__xmax__and

__Anpoints__are

used to determine which x values to plot. If

__Adata__is defined and

__A__is a

function of a single variable (ie. A(x)), data values are interpreted as x

values to be plotted. If

__Adata__is defined and

__A__is a function of two variables

(ie. A(x,y)), data values are interpreted as (x,y) pairs and

__A__becomes a mapping

function for the data.

**Acolor**The color for curve A. The values 1-4 map to black, red, green, and blue

respectively. A value of 0 turns curve A off.

**Adata**The point data for curve 'A'. If

__Adata__is set to the name of a file, data is

read and interpreted from that file. If

__Adata__is 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.

**Alabel**The label for curve 'A'. The curve label is printed in the legend when a curve

is defined.

**Alintype**The 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.

**Anpoints**The number of symbol points for curve 'A'. If

__Adata__is defined, all points will

be connected with the selected curve line, but only

__Anpoints__points will be

indicated with a symbol. This prevents messy graphs when large number of points

are defined. If

__A__is defined and

__Adata__is not,

__Anpoints__is used along with

__xmin__

and

__xmax__to determine which x values to plot.

**Asymsize**The symbol radius for curve 'A'. The default size is 100. A value of 0 turns

symbols off.

**Asymtype**This is the name of a segment in

__symfile__which defines the graphics symbol for

curve 'A'.

**Athick**The line thickness for curve 'A', valued from 0 to 4. A thickness of 0 turns

line drawing off.

**GRAPH** **FILE** **FORMAT**

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.

**EXAMPLE**

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

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