| |
bgraph (1)
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: |
|
The frame thickness, valued from 0 to 4. A value of 0 turns
the frame off. |
|
The grid: 1 is on, 0 is off. |
|
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. |
|
The origin axis thickness, valued from 0 to 4. A value of 0
turns the origin off. |
|
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. |
|
The point symbol metafile. |
|
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. |
|
The x axis mapping function. An x axis mapping
xmap(x)=log(x) produces a log x axis. |
|
The y axis mapping function. An y axis mapping
ymap(y)=log(y) produces a log y axis. |
|
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. |
|
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. |
|
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. |
|
The label for curve 'A'. The curve label is printed in the
legend when a curve is defined. |
|
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. |
|
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. |
|
The symbol radius for curve 'A'. The default size is 100. A
value of 0 turns symbols off. |
|
This is the name of a segment in symfile which
defines the graphics symbol for curve 'A'. |
|
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 calc(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 | impress | ipr
bgraph -curve +ymin -1 +ymax 1 sine2.plt | t4014
|
FILES
|
/usr/local/lib/meta/*.mta /usr/local/lib/meta/*.plt
*.plt |
AUTHOR
BUGS
|
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. |
SEE ALSO
|
